According to Giancarlo Esposito, he based his performance as Gus Fring on Edward James Olmos's performance as Lt. Martin Castillo in Miami Vice (1984). He noticed that Olmos was very quiet and still but suggested an inner turmoil. Esposito guest starred on that series three times.
Declan (Ferreira, Louis):
Who the hell are ya?
Walter White: You know.
Walter White: You all know exactly who I am.
Walter White: Say my name.
Declan (Ferreira, Louis): Do what? I don't...
Declan (Ferreira, Louis): I don't have a damn clue who the hell you are.
Walter White: Yeah, you do. I'm the cook.
Walter White: I'm the man who killed Gus Fring.
Declan (Ferreira, Louis): Bullshit. Cartel got Fring.
Walter White: Are you sure?
Walter White: That's right.
Walter White: ...
Every depiction of the drug money bring counted or transferred in large quantities (ie in bags) shows absolutely pristine notes, whereas the occasional shots of money being exchanged for drugs show crumpled, folded notes.
Opening credits use chemical symbols from the periodic table of elements as part of names : bromine (Br), and barium (Ba) for the title, none for creator Vince Gilligan (except when he gets a V for Vanadium), one for cast and crew members.
All episodes were rerun on an on-demand cable channel in some areas, without commercials but with additional scenes not included on AMC.