Goofs

The tattooed teardrop on Cry-Baby's face at the end of the movie appears and disappears.

Allison's hair changes length during the film. In the final scene at the end her goes from shoulder length to past her collar bone when she is singing.

In the courtroom, when the tire on Hatchet-Face's mothers "iron lung" blows out, you can see a cigarette-butt on the floor right next to the wheel, and when it cuts back to the main shot, her father throws the cigarette to the floor.

During the big dance scene in the jail with all the inmates, Cry-Baby's shirt is, from some camera angles, open all the way, and from other camera angles, just half way open.

When Allison is singing with the "Squares", after she adjusts the microphone she is on the other side and the microphones' lengths change between shots.

The prisoners are wearing 3D glasses while watching Creature from the Black Lagoon (1954), but the print they're viewing is normal black-and-white.

When all of the drapes are being taken into the courthouse to see the judge, Allison comes in with handcuffs on. The next time we see her, she has the handcuffs off.

While they're making license plates and singing in the prison with Cry-Baby it's obvious they're not hitting their hammers against anything.

At the end of the "King Cry-Baby" song, Hatchet Face's saxophone mouthpiece is on upside down ... reed up (incorrect) vs reed down (correct)

Movie is set in mid-Fifties but in effort to add period detail, Universal Pictures opening logo is old shot of plane circling globe - a studio logo that hadn't been used since Thirties or early Forties at latest.

The movie is set in 1954 (given away by the banner in the gymnasium during the polio vaccinations that reads "Congratulations Class of 54!"). However, Milton is seen reading a copy of "Tales To Astonish #12" in Ramona's house. That comic came out in October 1960.

The movie is set in 1954 and starts with everyone getting polio vaccines. The first polio vaccine was available in the USA in 1955.

When Cry Baby signals for Allison to come sing with him, his hand leaves the guitar strings but you can hear the guitar playing.

During the "King Cry-Baby" song, Hatchet-Face has a very impressive saxophone solo. However, it is clear that she is not really playing, because her hands never move up and down the saxophone.