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Unlike the episode, Walt would never be able to actually ride-along with DEA agents. They have strict rules about this and civilians are not even able to enter the DEA cars.
Vince Gilligan admitted in a Season 4 episode podcast that the location of the show was supposed to be set in Riverside, California. The original pilot was filmed there but they learned of the incentive ABQ was giving out for production teams to film there. They ended up staying in ABQ.
Bryan Cranston and Dean Norris were interestingly also cast in "Little Miss Sunshine" (2006). This movie had a part when the family makes a sleep-over stop in Albuquerque. Both actors showed up in the movie at this point. Therefore, it's possible that they were already scouting or starting production on Breaking Bad as far back as 2005.
Casting: Bryan Cranston and Anna Gunn have both previously guest starred on Seinfield. Anna played one of Jerry's girlfriends while Bryan was the infamous dentist Dr. Tim Whatley.
The chemical formula shown in the intros, C10H15N (149.24 molecular weight), is the real formula for methamphetamine.
A plaque on the wall of Walt's home says he did research in proton radiography in 1985 that contributed to someone's Nobel Prize win. According to the Nobel Prize website, the winners in 1985 for Chemistry were Herbert Hauptman and Jerome Karle who won for their development of methods to determine crystal structures.
A critic argues that no real-world high school chemistry lab would stock such a large amount of hydrofluoric acid. It's often bought in small amounts (maybe one gallon maximum) and severely diluted for simple chemistry experiments. Also, Walt should know that a strong solution of sodium hydroxide (i.e. similar to lye or caustic soda) would be a better choice to dissolve the body because it would convert fat to soap which would wash away with water.
Unlike they showed in this episode, Jesse and Walt wouldn't be able to clean up the mess very easily (e.g. baking soda and cleaning solvents). One critic argues that enough fluorine would be present to render the area as too toxic, leading the mess to be treated like toxic waste.
Although Krazy-8 presumably steals a piece of plate while Walt is unconscious, there aren't any missing plate pieces when Walt wakes up.
Werner Heisenberg (1901-1976) was a German physicist who is best known for his uncertainty principle in quantum theory. Heisenberg's uncertainty principle states that certain pairs of physical properties, like position and momentum, cannot both be known to arbitrary precision. That is, the more precisely one property is known, the less precisely the other can be known. This is, perhaps, a metaphor for Walt. The more we see the bad Walt, the less we know about the good Walt.
Walt says he used mercury fulminate as a decoy for meth in this episode. However, several sources report that mercury fulminate is highly explosive and agitating it as seen when Walt gets frisked and when Tuco is opening the bag with his knife would have most certainly set it off.
The 2008 writer's strike prevented the next two episodes from being aired subsequently as part of the first season. They were already shot and edited, so the episodes simply became the first two episodes of Season 2.
By the end of the season, we know what the title in this episode means. However, after the deal with Tuco at the beginning of this episode, Walt calculates how much he needs to make to keep his family afloat. He calculates that amount as "737" or $737,000.
The B&W movie Hector Salamanca is watching when they arrive at his house is Cantinflas' "El Mago" (1949)
At one point, Mark Margolis (Tio) starts using his bell to spell out SOS in morse code dings. This was suggested by Bryan Cranston.
Vince Gilligan admitted in an interview that Jesse was originally supposed to die around the end of season 1 (which technically includes the first two episodes of season 2).
Hank used the lowjack on Jesse's car to track down it's location in the desert. This is not said but strongly implied during the conversation with Jesse's mother with how much he spent on the car.
In this episode, Walter's second name is revealed to be Hartwell. This is actually a reference to executive producer Vince Gilligan's girlfriend, Lucy 'Holly' Hartwell Rice.
When Walter sneaks back into the hospital, they show him re-inserting his I.V. line on his own, showing the end of it as a needle he inserts. This is very unlikely as a real I.V. line does not retain any kind of needle after it has been inserted, the needle is actually pulled out and discarded, leaving only a flexible plastic line inside the vein.
Negro Y Azul is Spanish for Black and Blue.
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coping with death, parents and children, quest for hope, Medical, Crime