Factual error: Earth's moon is in the frame as a clear crescent after the explosion when Mark goes out. Mars' moons are not spherical, so can't appear like that. (01:10:00 - 01:11:00)
Character mistake: As Teddy is announcing the bad news, he calls Mark Watney 'Mark Watton'. (00:09:48)
Factual error: When the airlock blows off the "garden" section of the Hab, the initial leaks shows gases flowing to the inside of the chamber. The building pressure should be flowing to the outside as the airlock pressurizes.
Continuity mistake: Before planting the potatos he has to bring dirt into the HAB. The dirt on Mars is red due to high iron content. When we go to an inside view of the same dirt it's brown like here on earth.
