The straightest version is "I Don't Care Much" which was cut from the original production and added back later, but every version is missing at least a couple of songs present in other versions.
The song "Married", originally in the Broadway version, was cut from the movie. It can be heard playing on a radio in the background during the scene where Brian and Sally are discussing marriage.
Irony as She Is Cast: Liza Minnelli, a trained dancer, plays Sally - an untrained but enthusiastic dancer. She had a lot of trouble trying to learn to dance like an amateur.
Non-Singing Voice: According to Bob Fosse's biography, Broadway performer Mark Lambert recorded "Tomorrow Belongs To Me" - but apparently refused to dye his hair blond for the film. As a result, a German extra stood in for him on camera.
Show Within a Show. In April 2019, two television shows featured Cabaret as a show within a show and both titled their episodes "Life is a Cabaret", and in some places, the shows aired the same night. Schitt's Creek aired a Musical Episode that featured the community theatre's production and featured the songs "Wilkommen" and "Maybe This Time" performed by cast members. Fosse/Verdon portrayed the production of the film version, with Bob Fosse rehearsing "Mein Herr" with Liza Minnelli and casting actual prostitutes as extras.
Throw It In!: During the scene where Brian has to conduct Natalia's English lessons with Sally and Fritz present, Brian passes Sally a plate of cake, with the cake falling off the plate and hitting Sally's chest. According to Michael York, the cake was supposed to stay on the plate, but her reaction when it missed was amusing enough that they left it in. It does bring additional humor to a Cringe Comedy-filled scene.