Continuity mistake: Early in the film, Henry Fonda and another juror are in the men's room. When the other juror exits, the door is a swinging door. From the jury room the door is a regular door with a door knob. You can hear the door close when Henry Fonda exits and closes the door.
12 Angry Men (1957)
1 continuity mistake
Directed by: Sidney Lumet
Starring: Henry Fonda, Martin Balsam, Lee J. Cobb, John Fiedler, Jack Klugman, E.G. Marshall
Visible crew/equipment: In the scene where Henry Fonda is recreating the testimony of the old man getting out of bed & walking down a hall, you can clearly see a shadow of the camera on the floor.
Juror #5: Boy oh boy, it's really hot, huh? Pardon me, but don't you ever sweat?
Juror #4: No, I don't.
More trivia for 12 Angry Men
Question: Am I correct that when Henry Fonda is questioning the E.G. Marshall character about his recent activities Marshall says that the night before he worked until 8:30 then went home? The trial was every day for the past several days.
Answer: He was actually talking about the night before the last one. Trials, especially longer ones for serious crimes such as murder, are not usually on consecutive days...often there is a recess after the prosecution rests, and another after the defense, before closing arguments and the jury's deliberation. During those recesses, unless they are sequestered, the jury members would return to their normal lives (including work), and report back to the court when summoned.