Revealing mistake: Look closely at the footage when the vampires are entering the cave. Later when they are exiting the cave, the waves are flowing backwards. The same footage has been reversed. (01:17:05)
Max is the head vampire. Grandpa knew about the vampires all along.
Max: It was all going to be so perfect, Lucy. Just like one big, happy family. Your boys... And my boys.
Edgar Frog: Great! The Bloodsucking Brady Bunch!
Trivia: Mary Lambert was originally set to direct, but was fired due to creative differences between her and producer Richard Donner.
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