Channing Tatum revealed in an interview with Ellen DeGeneres that he wore an oversized prosthetic for the scene where he walks naked in front of Rachel McAdams character in order to get a realistic reaction out of her. This was apparently the take that was used in the final cut.
Loosely based on the story of Kim and Krickitt Carpenter. The Carpenters liked the movie but were disappointed by its omission of their faith in Christianity which was an important factor in their resilience.
Since the movie is loosely based on the real - life story by the Carpenters, they threw a huge fit because the F word was used by Rachel McAdams in the movie which The Carpenters didn't allow since they were strictly christians