The scenes of devastation supposedly caused by the fight with the slime people (shown briefly while the group is driving away from the airport) is actually footage of the Santa Monica Mountains shortly after a wildfire swept through the area.
In an interview, star/director Robert Hutton said that neither he nor the stuntmen were ever paid for their work in this film.
The scenes in the butcher shop and freezer were filmed in an actual butcher shop owned by the father-in-law of actor Robert Hutton in Lancaster, California.
The two bums who appear in the theater are played by Joseph F. Robertson and Edward Finch Abrams, the film's producer and associate producer, respectively.