In the famous dance routine in which Gene
Kelly sings the title song while twirling an umbrella, splashing through puddles and getting soaked to the skin, he was actually dancing in water with a little bit of milk added, so that the water puddles and raindrops would show up better
on film. Kelly was sick with a 103-degree fever at the time. A common myth is that Kelly managed to perform the entire
song in one take, thanks to cameras placed at predetermined locations. However this was not the case as the filming of the sequence took place over 2–3 days.
Debbie Reynolds was not a dancer at the time she made Singin' in the Rain — her background was as a gymnast. Kelly apparently insulted her for her lack of dance experience,
upsetting her. Fred Astaire was hanging around the studio and found Reynolds crying under a piano.
Hearing what had happened, Astaire volunteered to help her with her dancing. Kelly later admitted that he had not been kind to Reynolds and was surprised that she was still willing to talk to him afterwards. After shooting the "Good Morning" routine, Reynolds' feet were bleeding. Years later, she was quoted as saying that making this film and surviving childbirth were the two most difficult experiences of her