50/50 (2011) Poster



James McAvoy was cast as Adam, but had to drop out due to personal conflicts. Joseph Gordon-Levitt replaced him after being called by Seth Rogen less than a week before shooting was scheduled to start. He accepted the role just two days before.
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Adam is based on writer Will Reiser, who was diagnosed with cancer and later recovered. Seth Rogen, who plays Kyle, helped Reiser cope with his disease and convinced him to write a screenplay during their early 20s together.
Joseph Gordon-Levitt actually shaved his head during filming. He and Seth Rogen were improvising in character while the cameras kept rolling, since the scene was not in the script.
Seth Rogen says he was actually on the toilet when Will Reiser told him he had cancer. As funny as the two of them thought this was, it was deemed too disgusting for the film.
When Adam is listing things he has never done, one of them is that he has never visited Canada. That scene, as well as the majority of the rest of the movie, was shot in Canada.
Writer Will Reiser makes a cameo during Adam's party. He tells Adam, "My Uncle had what you have."
During a roundtable discussion with the cast, screenwriter Will Reiser revealed that Bryce Dallas Howard came up with the title of the film. The crew was skeptical about it when she first suggested it to them on the set of the art gallery scene. When she found out that the title had been changed to the one she suggested, she was surprised.
During a 2011 interview with "The A. V. Club," Anna Kendrick said that, while on the set, she often referred to her character as "the worst therapist in the world."
The original screenplay was titled "I'm with Cancer."
The screenplay for this film was featured in the 2008 Blacklist, a list of the "most liked" unmade scripts of the year.
Seth Rogen's wife, Lauren Anne Miller Rogen, plays Bodie, the woman walking the bulldog that Adam & Kyle talk with, while walking Skeletor.
While being interviewed by Terry Gross on her National Public Radio program "Fresh Air," Will Reiser said that he gave Adam's character a job at a Seattle NPR station because Reiser is a big fan of NPR, but he had not ever donated any money to any of their pledge drives.
Actors Matt Frewer and Philip Baker Hall have both played cancer patients in previous films, Watchmen (2009) and Magnolia (1999).
50/50 (2011) is Joseph Gordon-Levitt's second film beginning with the numbers 5-0. He previously starred in (500) Days of Summer (2009) in 2009. Levitt was nominated for the Golden Globe as Best Actor in a Comedy film for both movies, and both films earned a second nomination as Best Comedy at the same award.
Kyle's (Seth Rogen) license plate is YVR 515. YVR is the airport code for Vancouver, BC (Canada), where the movie was shot.
The opening scenes, featuring Gordon-Levitt jogging show him passing VFS - Vancouver Film School on Hastings Street, downtown Vancouver, British Columbia - supporting actor Seth Rogan's hometown.
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Nicole Holofcener was originally attached to direct.
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On one of the cubicle walls in the Seattle Public Radio offices, there is a small clipping visible from the free Seattle weekly newspaper "The Stranger."
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When Adam is waiting for the bus and Katherine comes across, the advertisement on the bus stop reads, "Only you can prevent wildfires."


The trivia items below may give away important plot points.

Summit Entertainment wanted a kiss between Adam (Joseph Gordon-Levitt) and Kathryn (Anna Kendrick) at the end of the film. However, the actors and crew agreed that it would not feel right since they felt the movie was about the main character's journey with cancer, rather than a love story. They almost filmed the scene to appease the studio, but Levitt pointed out that "If they gave the studio the option, they would use it," so they just refused to film it.
Kyle applies medicine and jokingly plays around with Adam's back wound. Seth Rogen did the same thing to screenwriter Will Reiser, who was diagnosed with cancer in his early 20s.

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