The theater in Ohio has "Die Hard with a Vengeance" as the feature film. The musical score of this episode departs from the usual X-Files standard spooky (or silly, if it's a humor episode) fare and creates a very tense and foreboding edge-of-your-seat atmosphere using French horns. The tempo and style are remarkably similar to the score of the Die Hard movies, but especially the one referenced.
The big inspiration for this episode is the movie with Richard Burton, The Spy Who Came in From the Cold, based in a fantastic novel by John LeCarre. The big idea of the episode is to find lies under new lies. They get a great ambient of paranoia that fits perfectly in this season 5 in which we have some kind of distance between Mulder and Scully.
The trivia items below may give away important plot points.
When Scully follows Mulder to the motel and she is confused as his wife, the name that she figures out that Mulder uses is George Kaplan, also one of the identities of Cary Grant in North by Northwest, another fantastic thriller full of lies.
The movie theater in Ohio has "Die Hard with a Vengeance" as the feature film. In this Die Hard sequel, John McClain is up against a group trying to rob the Federal Reserve Bank, which is the same method the militia members are using to spread the bio-weapon in this X Files episode.