The Hills Have Eyes (1977) trivia:
The dead dog that was slaughtered was believed to be a dummy but was actually a real, although already dead, dog. Director Wes Craven purchased the deceased mutt from the county sheriff's department.
The film is inspired by actual events. The 1400's legend of Sawney Beane and his family, consisting of 8 sons and 6 daughters, roamed Scotland where they captured, tortured and ate several transients. They were captured, judged to be insane and executed without trial.
Many of the props in the family's cave is from the film, The Texas Chainsaw Massacre.
Actress Dee Wallace is terrified of spiders and had no problem acting scared in her scene with the tarantula.
Wes Craven wanted the baby killed in the film but the cast and crew threatened to quit if the scene was in the movie.