Goofs

J. Carrol Naish's character of Dr. Durea / Dr. Frankenstein first refers to Lon Chaney Jr.'s character as "Grodin," although his name in the film is actually "Groton." After that one time, Naish gets it right from that point onward.

When Judith picks up Count Dracula's one-eyed demon-headed ring at the end of the film, she has flashbacks to several earlier events in it. However, the one flashback of Rico and his biker gang comes from a scene in it that Judith was not there for.

The two small holes in the side of the Oakmoor Cemetery caretaker's neck are substantially smaller than Count Dracula's fangs.

The order of the exhibits in the Creature Emporium boardwalk attraction changes from scene to scene throughout the entire film.

Dr. Durea / Dr. Frankenstein's use of the same injections of his blood serum alternately causes Groton to both transform into a savage, mindless killer and to be transformed back to normal.

When the Frankenstein Monster rips the door off of the car in the local Lover's Lane, it has no hinges on it.

When Judith is bound with rope to a railing by Count Dracula, the ropes binding her to it are so loose that she could have easily escaped any time she wanted to.

The spelling of Judith's name on the Las Vegas billboard and of her name on the telegram that she receives do not match.