Frankenhooker goofs

Jeffrey plunges a scalpel into the pet's brain, murmuring to himself to be cautious — he insists he doesn't want to perform a lobotomy. In reality, that is precisely what he is carrying out.

At approximately the 37-minute mark, Jeffrey measures Crystal's thigh and proclaims it "a perfect 18 inches in diameter," although he is actually measuring its girth rather than its diameter.

In the opening scene, the muscle chart Franken is marking with a red marker pen portrays the breasts as muscles, which is anatomically inaccurate.

Around the 34-minute mark, when Jeffrey seemingly drills into his head, the drill bit can be seen retracting into the body of the drill, then snapping back to its extended position as it is withdrawn.