Continuity mistake: The art/photography display at UT and the background change a few times when Mason is removing his photographs and talking to the woman. The photos along the right side of the display disappear. After Mason removes two of his photos, it doesn't look like the third one is still posted, but after the woman leaves it is visible. The backside of pictures show up through the metal display some time after Mason removes the first two pictures (but were not there when he first removed his pictures). A lot of people are moving around in the background when Mason and the woman are talking and two girls in blue shirts were there the entire time, but when the woman walks away the people in the background are gone. (02:10:44 - 02:11:50)
Continuity mistake: In the scene where the mother introduces Mason to her college professor, the class ends at 1:35 according to the clock on the wall. In the span of a few seconds as Mason and her mother walk to the front of the classroom the clock shows 1:55.
Suggested correction: The class was not over yet. After the clock showed 1:35 PM, the lecture continued about Pavlov's dogs, (un) conditional response, salivation, and the professor asking the class for another example, etc. The class emptying the room would also take a few minutes. Film time might not have been 20 minutes, but the clock showing 1:55 PM indicated that the class was over at this point. Liv and Mason then went to the front of the room.
I saw 1:38 PM, then class might have been over. It would not take 17 minutes for the classroom to empty (maybe 5 minutes or so). Change your wording to reflect this, and your mistake will be valid.
Continuity mistake: As the years pass, Mason dons a different haircut/style, but there is a period of time during which a particular haircut inadvertently varies in length, being shorter, longer, shorter, etc. within the same scene or day (as opposed to showing his hair gradually or naturally growing over several weeks). From the time he was picked up by his father until he is back home and step-dad Bill makes him get an almost-bald haircut, Mason's hair vacillates in length from above to below his shoulders and shorter or longer bangs.
Continuity mistake: When Mason is out with his friends and they are throwing blades at the wooden cut out, Mason throws a blade, than it cuts to his other friend, than it cuts back to the wooden cut out and the blade Mason threw suddenly disappears.
Continuity mistake: At an Astros game, a visiting Milwaukee Brewers player is shown batting with a dark shirt. Later, when the Astros win, all the Brewers are wearing white or light-colored shirts.