In the butcher's shop scene at the beginning of the film, Fred rescues Ernie who has been locked in the freezer overnight. Jack Douglas was covered in frost effect plastic for the scene, but the rest of the cast/crew felt he had got away lightly, and threw him into a river. See more...
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Continuity: When Professor Crump says "I've been shot!" after the tent explodes outside his caravan, a bottle of tomato ketchup starts dripping on him and you can see his pyjama top is completely clean, but after a quick cut to the bottle dripping, we return to Crump, and his top is more dirtier than it was previously.