Continuity mistake: In the opening scene at the beginning of the movie, the Sheriff and Fish & Game diver are going to tag beavers. There is a clear shot of the diver under water at the beaver dam with a white oxygen tank. Shortly after he is attacked, part of his suit surfaces in the water with a black/gray oxygen tank, not white.
Trivia: In the scene with Fonda and Gleeson reaching the morgue to look at the tooth, you can hear in the background a page for Dr Miner. Steve Miner directed the film.