'Brittany Runs a Marathon' trivia and fun facts
By the hair.
Utkarsh Ambudkar and Alice Lee have both appeared on "The Mindy Project", though never in the same episode
Reasonable likeness
Writer and Director Paul Downs Colaizzo has said that if there is a character in this film that is in any way based on him, it would be 'Seth.'
Weight Loss
Jillian Bell lost 40 pounds during the filming of the movie, just like her character does during the course of the film.
Marathon Trainer
Jillian Bell worked with a marathon trainer to help her figure out how her running style would look and evolve throughout the film as she goes from a novice to an experienced runner training for a long distance run.
Based on true events
"Brittany Runs A Marathon" is inspired by the true story of Writer and Director Paul Downs Colaizzo's real-life friend and former roommate (also named Brittany) who began a similar journey toward better health in her late 20s.
New York City Marathon
The cast and crew actually got to film at the New York City Marathon, making this the first time a non-documentary film crew has been allowed to shoot there.
Jillian Bell in the New York City Marathon
While filming scenes at the marathon, many of the runners thought that Jillian Bell was really running and was being filmed as part of a documentary. Several times other runners stopped to help her during more difficult scenes; she didn't have the heart to explain she wasn't actually running the marathon.