Despite being a classic for many years, some hidden facts about this cinematic gem have yet to see the light of day. The following list may surprise, and reveal things about the film that not many people these days know about. Let's start with a little-known tidbit about the film's production. Fact 1: Although it's a Christmas film, the scenes were shot in the spring and summer of 1989. 

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10 Surprising Facts About National Lampoon's Christmas Vacation

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10 Surprising Facts About 'National Lampoon's Christmas Vacation'