Breaking Bad

Season 4

Box Cutter

1. The website that Hank uses is MineralEmporium.com. In real life, this URL will redirect to AMC's Breaking Bad website.
2. Skyler's (Anna Gunn) weight gain is due to the actress contracting lupus
3. The box cutter sequence lasts almost fifteen minutes; one third of the episode's entire runtime.
4. A copy of "Everything's Eventual", a collection of short stories by Stephen King, can be seen in Gale's apartment.
5. First appearance of Lavell Crawford
6. Bryan Cranston's daughter was on set the day they filmed Gus cutting Victor's throat with the box cutter and she fainted seeing the sequence.

Thirty-Eight Snub

1. The pizzas at Jesse's party are uncut, like the pizza Walt throws onto the roof in season 3, episode 2. Badger says the pizza place doesn't cut their pizzas and "passes the savings on to you". Some viewers had said that an uncut pizza was ridiculous--and so does Jesse. Venizia's is a real pizzeria in Albuquerque, but they don't leave their pies uncut. The second appearance of the uncut pizza, and the discussion about it, was apparently made up by screenwriters to answer viewers' remarks about the first one.
2. Before Jesse goes to work after the party at his house, the last guy to wake up bears a striking resemblance to Bryan Cranston.
3. The snub-nose revolver Walt buys is a double-action Ruger LCR, with a tritium-dot front sight (for low-light conditions) and what appears to be an after-market low-profile grip.

Open House

1. The title 'Open House' references the self-destructive ways in which Marie Schrader as well as Jesse Pinkman try to distract themselves from facing their deteriorating lives: Marie by her role playing / kleptomania during actual Open Houses; Jesse by 'opening' his house to derelict meth heads derelicts and partying non-stop.
2. When Skyler is negotiating with Bogdan to purchase the car wash for $79,000 less than her original offer, Walter asks "$79,000?! Skyler, do you know how much money I make in a day?"Walter's original deal with Gus was for $3,000,000 for 3 months work (though after he brings Jesse on board and agree to split 50/50 with him, Walter is earning $1,500,000 for 3 months work) Walter is making $16,666.67 per day at this original deal, and negotiating down $79,000 is equivalent to about 4 and a half days worth of work.If we assume Gus still honors his second offer to Walter of $15 million per year to his family, then he is earning $41,095.89 per day, and negotiating down $79,000 is equivalent to about 2 days worth of work.
3. In the part from where Jesse is go- karting till he comes home, you hear the song 'If I Had A Heart' by Fever Ray. This song is used as the main theme for 'Vikings' (2013)
4. First appearance of comedian Bill Burr.

Bullet Points

1. When Walter and Hank are flipping through Gale's notebook, a Far Side cartoon with a "scientists in the laboratory" theme can briefly be seen on one of the pages.
2. When Walter and Hank are flipping through Gale's notebook, a 2008 Ron Paul for President sticker can briefly be seen on one of the pages.

Shotgun

1. Jesse mumbles the chorus from the song 'Fallacies' by his band 'TwaüghtHammër' while sitting in the car.
2. Hank Schrader is wearing a "DEA Fun Run 2006" T-shirt. Community outreach relies on continuity.
3. The episode's title is a reference to Jesse's riding shotgun with Mike and also a reference to the assailant holding a shotgun whilst Mike and Jesse are at a drop.

Cornered

1. The opening scene includes an accurate portrayal of carbon monoxide poisoning. The cherry red faces of the guards is typical in carbon monoxide poisoning.
2. The appearance of Walt Jr.'s new Dodge Challenger was the result of a product placement deal with Dodge.
3. Jesse uses the alias 'Diesel', as he does when trying to reclaim his money in Breaking Bad: Peekaboo (2009).
4. "¿Esta listo para platicar" on lid translates to "Ready to talk?"

Problem Dog

1. When Jesse is playing Rage (the on-rails shooter) at the beginning, there is an Easter egg on the wall when he is going down the stairs as pointed out on the commentary. Looking closely, the graffiti spells out "Gale".
2. At the beginning of the episode Jesse is shown playing the video game 'RAGE' (2011). Ironically enough, a character from the game, Dan Hager (voiced by John Goodman), is modelled on Walter White, the main character in this show.
3. In Gus's factory farm Aaron Paul wears a a t-shirt of Steve Aoki, brother of Devon Aoki.

Hermanos

1. Maximino Arciniega is named after Max Arciniega who played Krazy-8 in the first season.
2. The "ding" sound in the elevator that Gus takes is the same sound that comes from the bell on Hector Salamanca's wheelchair.
3. This episode's name is 'Hermanos' which is a Spanish word for 'Brothers'
4. According to Vince Gilligan, Gus and Max "probably were lovers" which adds another dimension to Gus's emotions over Max's death.
5. In this episode appears two actors previously featured in Scarface (1983), another story about a character that start to make money through drugs, Steven Bauer and Mark Margolis.

Bug

1. Vince Gilligan admitted on an interview that the fight between Walt and Jesse was inspired by the one between Tony Soprano and Ralph Cifaretto.
2. When Jesse and Walt are fighting at one scene you can see the game Rage (2011) on the shelf

Salud

1. As of 2012, this is one of only two episodes where Bryan Cranston and Aaron Paul do not share any scenes together. The other is Breaking Bad: Peekaboo (2009).
2. The fictional Zafiro Añejo Tequila presented as a gift from Gus to Don Eladio during the Cartel pool scene, is the same Tequila that Saul Goodman and Kim Wexler con a man for a whole bottle, at $150 a shot, in Better Call Saul. Furthermore, the man that Saul cons, Ken Wins, is the obnoxious stock broker from Breaking Bad season 1 episode 4, in which Walt short circuts Kens Red BMW battery causing the entire car to explode.
3. The only time in the series Walt accidentally calls Walter Jr. "Jesse".
4. The car Walt Jr. receives for his 16th Birthday is a Chrysler PT Cruiser.
5. The plane used to fly the crew down to Mexico is a Quest Kodiak 100, an American built light utility turboprop. The registration, XA-8AC, is the proper format for a Mexican registered aircraft.
6. The gift that Gus Fring gives to Eladio Vuente, Zafiro Añejo is a fictional brand of rare tequila. The writers of the show invented it when they were unable to secure a real product for the scene; no company wanted their product to be the one that poisoned Vuente and his men in the scene.
7. Walt asks Walt Jr. how his sixteenth birthday is going sixteen minutes into the episode.

Crawl Space

1. The only episode where Jesse's real age is revealed. The doctor who saved Gus after the Cartel attack says he's '25, smoker and drinker' and also says his blood type.
2. Hank mentions a buddy from Glynco. This refers to The Federal Law Enforcement Training Center (FLETC) located just NW of Brunswick, GA.
3. The electronic pulse in the last scene is the sound of the invisible Id monster's footfalls from "Forbidden Planet" (1956).
4. When Ted falls and bumps his head at the counter, you can see oranges falling from the top. The presence of oranges foreshadows the death of a character.
5. This episode ends in the exact sane manner as the last episode Felina(2013).

End Times

1. Only a pin head sized amount of ricin can kill someone in 36 hours.
2. To counteract arsenic poisoning, dimercaprol and dimercaptosuccinic acid are used as chelating agents that sequester the arsenic away from blood proteins.

Face Off

1. Rebecca Simmons, Walt's neighbor, is played by Vince Gilligan's mother, Gail.
2. This episode was originally written as a series finale because it was unclear if they were to be renewed for a new season.
3. The writing on the page in the notebook that the agent flips past says: WANT SCHRADER SCHRADER WHERE SCHRADER.
4. While Walt is in the car, waiting for news, he is listening to Coyote 102.5 FM. Coyote 102.5 FM (KIOT) is a real FM radio station in Albuquerque, NM.
5. The song playing as Gus walks to Hector's room is called Goodbye by Sascha Ring aka Apparat.
6. The make-up and visual effect of Gus Fring's death was done with assistance from the special effects team from fellow AMC drama The Walking Dead (2010).
7. The scene of Gus's death appears to be in one take but it is actually two separate shots. The explosion is one shot. The dolly shot of Gus's face and collapse is another. Vince Gilligan demanded 19 takes of the second shot to get it exactly right so that the two shots could be blended seamlessly. The 19th take is the one that appears in the episode.
8. The title "Face-off" refers also to Gus' death where half of his face is blown off in the explosion.
9. Ironically, Walt and Gus never come face to face in this episode, in spite of the title "Face-Off"