- The film is adapted from the best-selling novel published by Ben Sherwood in 2004. The novel was originally called "The Death and Life of Charlie St. Cloud", but the film was eventually named Charlie St. Cloud.
- In order to play Charlie in the film , Zac Efron gave up appearing in the film "Footloose" .
- The film was originally planned to be shot in Marblehead, Massachusetts, but the filming location was unanimously opposed by the crew. Finally, the film was shot in Vancouver, Canada and British Columbia.
- In order to find a suitable candidate to play Charlie, the crew once announced a public audition call on the Internet.
- The green restaurant named Flynn's Reach that appeared in the film is actually the Molly's Reach restaurant in the famous TV series "Beachcomer's Family". In order to shoot the film, this famous hotel in British Columbia also changed its name and changed into a "green suit."
- The first version of the film was written by James Schamus , Craig Pierce, and Lewis Colick , but James Schamus was not on the final script's signature and cast list .
Charlie St. Cloud behind the scenes gags
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Sam St. Cloud: Just can't wait, can you?
Charlie St. Cloud: Sully and Green leave for basic training in a week.
Sam St. Cloud: No, Charlie, I mean to get out here.
Charlie St. Cloud: C'mon. I'm gonna see you all the time.
[Charlie smiles and puts his arm around Sam's seat]
Sam St. Cloud: That's what Dad said.
Charlie St. Cloud: Yeah, but I'm not Dad.
[Charlie unwraps his arm from Sam's seat]
Charlie St. Cloud: I'm not gonna ditch you, Sam. I'm not gonna ditch you.
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[Charlie mistakenly drinks from Alistair's cup and coughs]
Alistair Wooley: You never steal another man's gin.
Charlie St. Cloud: Water...