This film is a drug induced hallucination that Clark has while in a mental institution
The events from the first film landed Clark in a mental Hospital where he imagines the events of this. It would explain why Rusty and Audrey's personalities are different in this film compared to all the others.http://tvtropes.org/pmwiki/pmwiki.php/WMG/NationalLampoonsEuropeanVacation
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