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Other mistake: In the second film, wedding photos of Mavis and Johnny only showed Johnny, since vampires don't show up in photographs. However in this third film, this is forgotten about and when Mavis takes pictures underwater at the volcano, Dracula is seen in the photo.

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Continuity mistake: As the monsters are walking down a hallway towards the dance party, Frankenstein has his lobster claw hands and he's walking with them swinging happily out and in front of him with stride. But in the next shot suddenly his arms are down calmly by his side as he walks more casually. (01:07:50)

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Continuity mistake: Before diving down to see the underwater volcano, Dracula, Mavis, Dennis, and Johnny are walking on the deck in their scuba gear. They are walking side by side, but in the next shot they are suddenly single file. (00:36:55)

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Continuity mistake: Dracula pushes his daughter Mavis out of the attic room when he's on the phone with a witch and shuts the door behind her. Mavis is shown standing there in a shocked expression with her back to the door. But in the next jump cut, she's suddenly turned 90° and has her hand on the door handle, frowning. (00:11:55)

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