Character mistake: In a scene when Watney is recording his video log, he imagines what would happen if his pressurized shelter suddenly would break. He concludes that he would implode, but the correct wording would be explode.
Character mistake: When Gaby's car becomes wedged between two buildings, she says, "Good plan. All we have to do is get over two twenty-foot walls and a minefield." While minimal backstory is given, I think it reasonable to assume that she has lived in what was East Germany all her life. It is thus highly unlikely that she would express a measurement in English units (being bilingual doesn't mean you automatically convert measurements). She would have said something like "six meters."
Character mistake: When Claire and Lowery look at the gyrosphere in red on the control panel, written above the gyrostation is "Return Request Disbhatched." Dispatched is misspelled. (00:55:20)
Character mistake: The poster on the wall near the start reads "Our Egg Donor's [sic.] are helping to fulfill the dreams of women across America." There is an unnecessary apostrophe in the word "Donor's." (00:10:05)
Character mistake: In the exchange at the train station in district 2, Katniss says how she killed Cato in the 74th games, and Cato killed Thresh and Thresh killed Clove etc However Cato didn't kill Thresh - he was attacked by the mutts and killed by them. (00:14:50)
Character mistake: When 47 is leaving the embassy a marine asks him if anything is wrong. 47 is wearing sergeant's stripes. Marines do not call sergeants sir.
Character mistake: When confronted by bears along the trail, Bryson identifies them as "Grizzly Bears", but the only bears that exist along the Appalachian trail are black bears. Grizzly are only in the Mountain states like Montana and Wyoming, and Alaska.
Character mistake: Sciarra's (pronounced Shara) name is constantly mispronounced Skeeara, even by Italians like the priest at the funeral.
Character mistake: Oh claims to not understand the word "my" when he is with Tip and always refers to her mom as "mymom" and "your mymom." But he seemed to understand the meaning of the word perfectly before because he talks about "my best friend Kyle" in his evite.