The scenes featuring two teenagers who are hassled by the cops while necking in their car were added because actress Joyce Molleur broke her leg during filming, and was unable to perform her original role.
The entire film was shot with a hand-held camera that could only record 32 seconds of film at a time. It was also shot without sound; all the lines were dubbed later by two men and one woman. Jackey Neyman cried when she first heard her dubbed voice.
The only cast members who were paid for their performances were Jackey Neyman, who got a bicycle, and the Doberman, which got a bag of dog food. The rest of the cast was supposed to receive a cut of the movie's profits, which never materialized. Director Harold P. Warren also gave the crew shares, instead of a salary.
Writer/director/producer/actor Harold P. Warren was an insurance salesman (later a fertilizer salesman) from El Paso. He made a bet with visiting location scout Stirling Silliphant (later an award-winning screenwriter) that he could make a popular horror film on an extremely minimal budget.
The film had a gala premiere in El Paso. Many local dignitaries attended. Members of the audience began heckling the film during the premiere. Many of the film's cast and crew sneaked out of the theater before the film ended, to avoid having to admit being part of it.
In 2011, Benjamin Solovey found the work print, made from the original 16mm reversal stock. It was in pristine condition. Solovey is restoring the material for a potential Blu-ray release in the near future.