Continuity mistake: Just after Sonny says, of Sal, that "that man bites" a potted plant seems to disappear then reappear from the counter. Sonny and the head cashier are moving down the counter getting the cash from each position as they go and, if you look at the signs on the counter, you can see that some shots are shown out of order; there are some shots of "Maria"'s position (no plant) interleaved with the previous position (with a plant). But the end effect is the same - appearing and disappearing plant. (00:12:20)
Dog Day Afternoon (1975)
Ending / spoiler
Directed by: Sidney Lumet
Starring: Al Pacino, Carol Kane, John Cazale, Penelope Allen, Beulah Garrick, Sully Boyar
Sal and the hostages are taken to the airport in a car and as there about to go to the plane, the driver gets a hidden gun, shoots Sal in the head and Sonny is arrested. All the hostages are free and Sal is lead off on a gurney while the police read Sonny his rights. Sonny goes to federal prison for 20 years. Leon gets the sex change operation. Angela (Sonny's wife) and her children live on welfare.
Kruger-Brent
More mistakes in Dog Day Afternoon
Leon: I mean, how do they expect you to get uncrazy if you're asleep all the time?
More trivia for Dog Day AfternoonMore questions & answers from Dog Day Afternoon
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Answer: Because Sal was in the bank with his gun.