Continuity mistake: When the Drapes are singing to Allison/Baldwin/Mrs. Vernon Williams, the song, "Gee, I Love that Girl" in the speeding cars, Hatchet-Face's gold earrings are on, then off, then on again. They are seen again in other scenes.
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.