Continuity mistake: When the secret weapon is released from Professor Digitalus' Museum, it demolishes the door and scares every cat onto the Star of Hong Kong's anchor. Just a few minutes later, Fievel can be seen passed out on an eyehook in the vacant museum. That's where a flame ignites a trail of kerosene, but when it soon becomes a full-blown fire, the door is once again intact (locks, chains and all) as though nothing happened.
Picture added by ryguy_1983
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