Continuity mistake: In the very beginning of the film when all the kids are leaving school and Lenora is standing on the steps watching Allison talk to the drapes at first her hair barrette in on one side of her head and the camera goes to Cry-Baby and Allison. When the camera switches back to Lenora her hair barrette has somehow moved to the other side of her head.
Factual error: In the time Cry Baby is based, there was racial tension (the judge even makes a racial remark about negroes being present). The jails would have been segregated until 1965, yet when Cry Baby goes to jail, both whites and blacks are in the scene. The only time whites and blacks were ever together was during rec time and meals.