Alfred Hitchcock famously had cameos in all his movies, but he personally felt that the story was so personal, and so important, that he decided not to have a cameo. Instead, he introduces the movie in a prologue. This marks the only time in any of his movies where he talks to the audience.
This film is set in Paleolithic Europe, about 80,000 years ago.
Four different species of Pre-human appear in the movie.
The main characters, played by Everett McGill, Ron Perlman (his first film role), and Nameer El-Kadi are meant to be early, primitive Homo Sapiens.
Rae Dawn Chong’s character is from a tribe of more evolved Homo Sapiens. Close to modern humans.
The tribe seen near the beginning are supposed to be the Ape-like Homo Erectus.
And the cannibalistic tribe seen later are supposed to be Neanderthals.