Must be one of your favorite movies, from all the details you've managed to collect.  I have to admit it's one movie that' stuck in my memory for 40 years. 

Trivia:  Remember that Twilight Zone episode where William Shatner is an airplane passenger, and he sees a furry gremlin tearing apart the engine on the wing?  That one has stuck in my memory also, and it was written by the author of Duel, Richard Matheson.

Phil