Trivia: Dog Day Afternoon
- Ability Over Appearance: See Dawson Casting.
- Actor Allusion: John Wojtowicz stated that he based his persona while talking to the cops on Al Pacino's performance in The Godfather, which he'd seen just hours before the robbery. Thus, Pacino became the natural choice to play him.
- AFIS 100 Years 100 Thrills: #70
- AFIS 100 Years 100 Movie Quotes:
- #86, "Attica! Attica!"
- Dawson Casting: John Cazale was in his 30s when he played Sal, who in Real Life was barely out of his teens. Lumet didn't want to cast Cazale at first due to the obvious age discrepancy, but Cazale gave too good a performance.
- Hey, It's That Guy!: Hey, it's Prince Humperdink!
- Retroactive Recognition: Lance Henriksen as the FBI agent who drives the car in the final scene.
- Throw It In: Much of the dialogue was ad-libbed or improvised, most notably "ATTICA! ATTICA!" Al Pacino also didn't know that John Cazale was going to say "...Wyoming?" when asked what foreign country he wanted to escape to, and his reaction is genuine.