Deliberate mistake: The disco ball doesn't start reflecting the sunrise until after the lead characters get out, even though it should have began to reflect light right when the door opened.
From Dusk Till Dawn (1996)
1 deliberate mistake - chronological order
Directed by: Robert Rodriguez
Starring: George Clooney, Harvey Keitel, Salma Hayek, Juliette Lewis, Cheech Marin, Quentin Tarantino, Danny Trejo
Continuity mistake: In the final battle, Jacob turns into a vampire and bites Scott, when Scott hits Jacob with the holy water bomb, Jacob backs away from Scott, when Jacob removes his mouth from Scott's neck, there is no blood on it, two cuts later, there is blood on Scott's neck.
Jacob Fuller: He's my son.
Seth Gecko: Oh yeah? How does that happen? You don't look Japanese.
Jacob Fuller: Neither does he. He looks Chinese.
Seth Gecko: Oh well, excuse me, all the hell.
Trivia: Sex Machine's 'crotch gun' is used in Desperado, which also stars Quentin Tarantino and Danny Trejo (the barkeeper).
Answer: Because he is a sadistic lunatic and he wanted to. He has a lot wrong with his brain, paranoia, psychopathy, hallucinations, sexual predation. Probably more. He is a deeply disturbed individual and killing Gloria gave him pleasure.
lionhead