Continuity mistake: In the breakfast scene, the baby's hair starts off styled, then is teased up haphazardly, then is styled again.
Continuity mistake: When Baby's family drive into Kellerman's you can see the back of the mum's head, and her hair is blonde. In the rest of the movie she has red hair. This is because the original actress cast as her mother changed after filming had already begun. (00:02:55)
Continuity mistake: When Max is talking with Tito at the end during the final show they're both talking and standing next to the record player. In the next scene they're both standing way off stage (no longer next to the record player) and then Max enters on stage and Tito walks up behind him. (01:27:25 - 01:28:25)
Continuity mistake: In the scene were Johnny is fighting Robbie, his belt breaks, and is hanging down. Next shot it is fastened again. And then it is hanging down again. (01:11:45)
Continuity mistake: When Baby and her Dad are on the porch, having a serious conversation about the money for the dancer's abortion, the Dad's collar on his jacket is turned up, then down, then up again. (01:19:35)
Continuity mistake: In the scene where Patrick has just given his speech about how wonderful 'Baby' is, he finishes, walks to the side of the stage, puts down the mike stand and takes off his jacket. In the very next shot, he puts down the mike stand and takes off his jacket again. (01:30:10)
Continuity mistake: When Johnny has realized that he locked his keys in the car, he takes the pole and breaks one of the car windows with it. The hole he made was about the size of a fist. In the next scene however, the hole in the window is twice as big as it was before. (00:40:35)
Continuity mistake: In the scenes where Johnny and Baby have to break into the car, when Johnny looks in to find his keys, it's raining, when he turns to grab the post to break the window, the sun is up and the ground is dry, then when he turns back to actually break the window, it's raining again.
Continuity mistake: When Baby is kissing Johnny after he talks about women using him, the blankets are tucked into her armpit, but then in the next shot they are neatly lying around her waist. (01:05:00)
Continuity mistake: During the entire part where Penny is sick after the abortion, Baby's hair alternates between really curly and wavy. When she gets out of Johnny's car it's wavy, when she runs down to get her father all the way up until the part where her father sees Penny it's curly, after that it becomes wavy again. (00:51:05)
Continuity mistake: When Baby is getting dressed for the talent show, she is rolling down individual stockings, when she starts dancing with Johnny, there are no garters showing, even though her dress goes all the way up.