The Avengers star also told EW that he was initially confused about the nature of the Woody Allen film after first receiving a letter from the director with 15 pages of the script.
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Hiddleston said: "It was three sentences long. 'Dear Tom, I'm making a movie in Paris this summer. I attached some pages. I'd love for you to play the role of Scott'.
"The character was only referred to as 'Scott'. So I thought, okay, this guy Scott is in a scene with a character called Ernest and a character named Zelda. Is Woody Allen writing a movie about F. Scott Fitzgerald?"
Hiddleston however clarified that he only found out the truth after coming onto the set and asking Owen Wilson about the movie.
He continued: "But there was this other character called Gil and I couldn't figure out who Gil was! I showed up on the set the first day, doing rehearsals and camera tests and I asked Owen, and I swear this is the God's honest truth, I had to ask him who exactly Gil was.
"He said, 'Oh no no, I'm from now. See, there's this time machine'. And then he told me the entire story. I was so very glad I asked."
The 31-year-old also said that the film was a pleasure to be a part of, adding: "It was one of those things where it's like, Paris! Woody Allen! It was a dream, such a great, surreal time."
Watch the trailer for Midnight in Paris below:
