There were three characters that were supposed to be displays in the Waxwork, but left out of the film for legal reasons: Jason Voorhees from the Friday the 13th series, five children from Village of the Damned (1960), and The Thing (1982).
After the policeman visits the Waxwork with Mark he realizes that many of the statues of the victims resemble missing people from posters he had seen. These posters are actually just copies of one of the posters from the opening credits of The Lost Boys (1987). All of the missing person posters have a single photo of a missing adult, but the posters all have the same information on two missing children: "William G. Bailey 7-26-62 Sandy blond hair brown eyes Missing since August 6, 1979 (or 1973) Call the Santa Carla Police Department" and "Susan Wilbur 5-30-69 Black Hair Blue Eyes Missing since February 6, 1983."
The human flesh being eaten at the vampire dinner is actually made of rhubarb, watermelon, and strawberries.
Kane Hodder (famous for portraying Jason Voorhees), who did stunt work for the movie, also had an uncredited role in the film as Frankenstein's monster.