To promote the film, Warner Bros. issued a statement that it would pay $10,000 to Joseph F. Crater--a prominent New York City judge who disappeared in August of 1930--if he would come to see the movie at the box office. Crater never came, and his disappearance remains unsolved.
Did she show up yet?
Butch Saunders: Nah, she's late.
Joe Musik: Late for her own funeral.
Butch tells Capt. Webb he found Caesar on a roof on 10th Avenue, which is on the west side of Manhattan. However from shots from the roof, the Manhattan Bridge is visible, which spans the East River from Lower Manhattan to Brooklyn. The bridge is too close for the rooftop to be on 10th Avenue.
The opening credits are presented as papers from a file cabinet. A man's hand turns each paper and put's it back in the file.
When the movie was re-released in 1936, the credits were revised to list the then-popular Bette Davis first. The re-released version is the one shown on the Turner Classic Movies channel. It is unknown whether other changes were made.