Deliberate mistake: The atmosphere on Mars is only 1% as dense of that as Earth, so 175kph windstorms would feel like a light breeze. They would have very little effect on the astronauts or MAV. The writers of the book and the film were aware of this, it was a small cheat to let the rest of the story unfold.
The Martian (2015)
1 deliberate mistake - chronological order
Directed by: Ridley Scott
Starring: Matt Damon, Jeff Daniels, Jessica Chastain, Kristen Wiig, Kate Mara
Factual error: When the crew is walking around the area of the Hermes with artificial gravity created by spinning the ship, the angle of the crew members' bodies should be perpendicular to the curved floor of the ship. However, in multiple shots, the crew standing at different locations of the room are seen standing at the same angle, directly upright.
Mark Watney: Fuck you, Mars.
Trivia: The secret project created to use the Hermes to return to Mars to rescue Watney was called Project Elrond, a reference from the Lord of the Rings (also used in the original book of The Martian). Mitch Henderson, played by Sean Bean, was an attendee at the Project Elrond meeting. Sean Bean also played Boromir, who was an attendee at the Council of Elrond in the LOTR movie.
Question: Exactly how long has Mark Watney been alone on Mars during the course of the movie?
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Answer: In the book, he's stranded on sol 6, and leaves on sol 549, making it 543 sols (554 days). In the movie, he's stranded on Sol 18 and leaves on sol 561, making it 542 sols.