Brad PittBrad Pitt turned down an offer to star in this film and chose, instead, to star in Se7en.
Marilyn LovellMarilyn Lovell really did lose her ring down the drain but eventually found it again.
Tom HanksTom Hanks is too tall at 6'1" to be an astronaut. The maximum height for an astronaut is 6'0".
Gene Kranz (Ed HarrisEd Harris) gives a list of instructions to his team at Mission Control and finishes by saying, "Failure is not an option!" [?] Gene Kranz did not actually say this during the Apollo 13 mission, but he liked the line. He would later use it as the title of his 2000 autobiography.
After the premiere of the film, Ron HowardRon Howard asked the audience members to write reviews of the film. While most of the reviews were positive, one review stated that there was no way the crew would have survived the mission. Apparently, the person who wrote it did not know the film is based on a true story.