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Continuity mistake: When the father exits the pool his wet hairstyle changes in every single shot.

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Continuity mistake: During the punch-monkey fight, Phil Betterman lies on the floor, exhausted, with his pendant resting on the floor, next to his ribcage. In the next shot it lies by his chest. Though he could have moved it between shots, the movie implies he is so tired he is lying motionless on the floor all the time.

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Continuity mistake: When Jordan is flirting with Naomi at the party a woman walks by and tells him that his wife is waiting. Naomi's left arm is raised or lowered depending on the shot.

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Continuity mistake: When Dr. Frankenstein asks Dracula "What purpose?", the doctor's hairstyle changes. (00:04:10)

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Continuity mistake: When Grandpa exits the supermarket and lies on the floor his cap is on. A shot later it lies several centimeters away.

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Continuity mistake: When Grandpa is hanging the Xmas lights Sally's arms are crossed. Check her left fingers resting on her right elbow. They change positions in every shot.

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Deliberate mistake: In the Spanish release, the name of the family store is written in Spanish, but inside the place it's in English everywhere. This is a very common mistake in foreign kids' films released in Spain.

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Continuity mistake: When the movie begins and the villagers are raiding the castle, Dr. Frankenstein tries to sneak through a basement door. Dracula produces an explosion and Doc turns his head away. From the opposite angle it's still facing forward.

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Continuity mistake: When Santa tells Noelle he's anxious about inheriting his dad's role, the position of his arms is inconsistent between front and side shots.

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Revealing mistake: During the trampoline scene, there's a side shot of Grandpa jumping high. It is a very obvious stuntman for De Niro who looks nothing like him.

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Continuity mistake: When Groucho tells Chico that he wants to hire the singer his cigar is in his mouth. A shot later it disappears.

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Audio problem: After Chico and Harpo first meet there's a man at the opera playing a drum. Not only is he out of sync with the sound we hear, but he is mimicking the blows.

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Continuity mistake: When Peter reads his essay in class his folder keeps swapping between being open and closed, and parallel or perpendicular to the table.

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Revealing mistake: When De Niro/Grandpa falls down the roof and hangs on to the drain, he is replaced by an obvious stuntman with a wig and thinner build.

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Continuity mistake: When Grandpa shows his old phone to Sally the way he holds it differs between the front and back shots.

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Revealing mistake: After escaping from the roof, John walks inside the building. When he runs towards a huge vent his bare feet swap to wearing black shoes.

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Revealing mistake: After barefoot John rolls down the stairs with the German thug one can notice the top of John's (his stunt in this case) protective sock around his left foot. (00:35:44)

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Continuity mistake: During the first scene where Groucho and Claypool seat back-to-back, the chairs are sometimes right next to each other or in different positions.

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Continuity mistake: Right before Sandman is turned into sand he raises his hands to protect himself. A shot later they're lowered, and he raises them again.

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Continuity mistake: Before Sandman is turned into sand, the craw-like machine lifts up tons of sand but it never gets in his eyes nor sticks to his shirt.

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