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: 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 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)
Answer: It would be improper to cause a scene, plus Robbie admitted to getting Penny pregnant and insulting her, especially it's what made get an abortion and medical complications.