Eric Eisenberg reported on Cinemablend that during the Los Angeles press day for Long Shot, the movie's director, Jonathan Levine, and its stars, Charlize Theron and Seth Rogen, all related that after Andy Serkis accepted the role of Parker Wembley, he then developed an extensive prosthetic makeup design for the character--a makeup regimen that required hours a day to execute--even though nobody asked him to do that. Rogen remembered, "we offered him the role, and then he was like, 'Okay.' And then he started sending ideas for what he would look like. And we were like, 'What do you mean? I thought he kind of looked a lot like Andy Serkis.' But he was like, 'No, I got this whole thing.' And we were like, 'Whatever, man!'"
Charlotte's waving coach and the drug dealer in Paris are the same person.
The title of the film is a triple entendre: 1. Charlotte and Fred's relationship is a long shot. 2. Charlotte winning the election is a long shot. 3. Fred "shooting himself" in his own face is literally a long shot.
Fred comments that Charlotte ran for student council in 1991, when she was 16 and he was 13. Based on this, Charlotte is now 44, and Fred 41. During filming, Charlize was 43 and Seth was 36.