Continuity: When Cpt. Lawton is talking to the secretary at the newspaper, the pencil stuck behind her ear keeps disappearing and reappearing. It is there when the secretary is seen from behind, and is gone every time we see her face.
Great sites
Mistakes
When Dr. Strowski approaches the door to the house in the swamp, the door is a dark color with a circular ornament in the middle and only two panels. When the same door is seen from inside the house (the door opens inward), it is a light color, with five panels and no ornamentation. See more...
Bride of the Monster mistakes
Continuity: Lobo has a very distinct scar on his cheek in the beginning and end of the movie. However, just after Dr. Strowski has entered the house, Lobo is seen coming down the stairs, and his scar is completely gone.
Continuity: In the beginning of the movie, we se Lobo chasing off the two hunters. Lobo is then standing outside in the torrential rain, but when he walks into the laboratory a few seconds later, he is completely dry.