Trivia / Run Fatboy Run

• Actor Allusion: David Walliams' cameo is similar to his Little Britain character who goes into shops asking for oddly specific things.
• Enforced Method Acting: in the scene where Simon Pegg and Hank Azaria are talking in the locker room, Simon's shocked reaction to Hank dropping his towel was very real. Apparently, Hank was supposed to wear a modesty patch over his genitals, but it didn't fit, so he did the scene without it.
• No Budget: The film is about a man entering a running event but the budget was originally too small to stage one. Nike agreed to step in as a sponsor and provided the necessary money and materials, resulting in the Product Placement surrounding the river run.