Corrected entry: The first time you see Gromit making a house of cards, there are only three triangles [not including the ones with the point facing down], later, when it shows the house of cards a second time [and Gromit has already finished the second level], the first level now has four triangles and the second layer has three.
Continuity mistake: When Wallace races out to get the crackers Gromit is seen spinning in his chair, to the right of the screen is the handbrake in the down position. When the ship blasts off Gromit realises he's left it on and puts it from the up position to the down position. (00:08:30 - 00:09:20)
Trivia: Gromit was originally supposed to be a cat, but it was decided that a dog was easier to sculpt from plasticine.
More questions & answers from A Grand Day Out with Wallace and Gromit
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Correction: When building a 'house of cards', you can build out as well as up. Remember time has passed, and Grommit has carried on building, just as the team at Aardman, did when creating the scene [and actually building the 'house of cards'].