Go Grease Lightning! The Best Facts About The Film
Kenickie changed roles
Due to Grease being a Broadway production before it was turned into a film adaptation, Jeff Conaway was cast as the role of Danny Zuko in the musical before he was even considered to star in the film.
However, when it came to the casting call, everyone decided that he was better off playing the role of Zuko’s best friend Kenickie, rather than playing the leading man. We can’t imagine anyone but John Travolta playing Danny Zuko in the end, so it was probably for the best.