गूफ़

A poster prominently displayed announces the Hippodrome Theatre's closing "Sunday May 19th" (no year specified). The script tells us that World War II had already broken out in Europe, but the USA had not yet entered. May 19th fell on Sunday in 1940, so that must be the year they had in mind, however, the Hippodrome actually closed on Wednesday, August 16th, 1939 and was torn down that same year.

Donald O'Connor wears a gold ring on his left ring finger in almost all of his scenes. The ring is missing when he performs "A Man Chases a Girl (Until She Catches Him)", in the scene with Marilyn Monroe just before that, and in the film's climactic scenes.

Rings are not permanent fixtures, he simply removed the ring at some point and chose to no longer wear it.

On the marquee on opening night the Donahue daughter's name is spelled "Katie". On the poster for "34th week" it is spelled "Katy".

Spellings on marquees and posters were not always accurate in real life, this reflects that.

During the "Heat Wave" number, Marilyn Monroe accidentally pokes her finger in the eye of a dancer standing between the branches of a prop tree.

Molly sings "There's No Business Like Show Business" at the show commemorating the closing of the New York Hippodrome. The theater closed in 1939. The song was introduced by Ethel Merman in 1946 when she debuted the role of Annie Oakley in "Annie Get Your Gun" on Broadway.