Giles Keyte/20th Century Fox
If you want to know what parts of the story screenwriter Drew Goddard and director Ridley Scott chose to leave out, we have your answers.
Weir told Tech Insider that Goddard and Scott incorporated his feedback into the script. But Weir said he was disappointed the movie left out Watney's first line in the book: "I'm pretty much f***ed."
"I guess there's only so many F-bombs you can drop in a PG-13-rated movie," Weir joked.
Although more of the book stayed intact than we expected, the movie version does leave out some cool and nail-biting scenes in the novel.
Keep scrolling to see some of the best moments the film's producers missed.
Warning: Spoilers ahead if you haven't read the book or seen the movie.