- 'Brooks, Mel' ' voice is dubbed in for a singer in "Springtime for Hitler".
- The "Springtime for Hitler" sequences were filmed at Broadway's Playhouse Theater (torn down in 1969), whose marquee can be glimpsed momentarily. However, in the scene where the theater blows up, we see the marquee of the Cort Theater, which stood (and still stands) across 48th Street from the Playhouse.
- The character played by Gene Wilder is named Leo Bloom. His co-star Zero Mostel became famous for his portrayal of James Joyce's character Leopold Bloom in an off-broadway production of Ulysses In Nighttown.
- Because of the "Springtime For Hitler" musical number, the film was banned in Germany. It wasn't shown in that country until it was included in a film festival featuring the works of Jewish filmmakers.
- 'Brooks, Mel' wrote the libretto of a real-life Broadway musical flop, "All American", which starred Ray Bolger and ran for 80 performances in 1962.
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