Continuity mistake: In the scene in which they discuss Sylvia smoking, the paper on the table is different between shots. In the shots of Sylvia there is some paper near the can on the left. In the shots of Sal, the paper is not there. (01:03:00)
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
Sonny: Bank robbing is a federal offense. You got me on kidnapping, armed robbery. You're gonna bury me, man.
Answer: Because Sal was in the bank with his gun.