Revealing mistake: Joe is much too old to be in high school. He appears to be in his thirties (the actor playing him was 35 at the time).
Earth vs. the Spider (1958)
Directed by: Bert I. Gordon
Starring: Ed Kemmer, Eugene Persson, Gene Roth, June Kenney
Revealing mistake: When the spider is being electrocuted and falls off the cave wall, you can easily see the string that was holding it.
Revealing mistake: When Mike and Carol are trying to escape the cave, Carol's head disappears behind a matte painting of a cave wall. (01:05:15)
Mike Simpson: Suddenly I feel hungry.
Carol Flynn: Me too.
Mike Simpson: Hey I just remembered, I've got a candy bar with me.
