Frequently Asked Questions About Time Travel

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• When Ray first meets Cassie she is wearing a pendant of a butterfly; possibly a nod to one of the most famous time travel short stories, A Sound of Thunder by Ray Bradbury, where a time traveler changes the future (his present) by stepping on a butterfly in the distant past.
• As the three main characters leave the cinema there are three posters shown behind them: "A Boys Life" (the original title of E.T. The Extra-Terrestrial), "Watch The Skies" (the original title for Close Encounters of the Third Kind) and "Paradox" (working title for Back to the Future Part II).
• One of the most famous time travel short stories, A Sound of Thunder by Ray Bradbury, where a time traveler changes the future (his present) by stepping on a butterfly in the distant past, is referenced during a discussion of the 'rules' of time travel, with Pete saying "You can't tread on any butterflies"
• Movie Goof (continuity error): In the café after Ray gets fired from his job, the same extra walks past Ray twice.