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: Debbie Reynolds was severely intimidated by power-dancer Gene Kelly. Her feet were blistered and bleeding after just one day on the set with him. She sobbed about working with Kelly so much that her good friend Fred Astaire privately tutored her, gently, in the dance routines.
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.