Trivia: Donald O'Connor admitted that he did not like working with Gene Kelly because he found Kelly to be a bit of a tyrant on the set.
Trivia: In the famous scene when Don Lockwood is singing in the rain, apparently Gene Kelly (Don) was suffering from a fever.
Trivia: During the "Good Morning, Good Morning" sequence, Debbie Reynolds' tap dancing was dubbed over by Gene Kelly.
Trivia: In the following dance sequences: "All I do is dream of you", "Beautiful girl", "Good Mornin'" and "Broadway Rhythm" - all the girl dancers are wearing the same shoes each time, but different colour.
Trivia: When Gene Kelly is dancing in the rain, he was wearing a wool suit which kept shrinking on him. In order to be able to move to dance, he had to change his suit several times.