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: Ben Bart passed away earlier in the film but can be seen dancing on stage with the character Gertrude, at a James Brown concert where he is performing "I Got Soul (Super Bad) ". (01:46:00)
Suggested correction: During that sequence, they intercut James in his gold jumpsuit, with long hanging-down hair, and James in a black-and-white checked vest, doing the same song. In the black-and-white vest era, Ben Bart is still alive, so the dancing could have been from that era.
While that does seem to be the case, it should be pointed out that Ben Bart died in 1968, but the song James Brown is singing, "Super Bad", was recorded in 1970.
Continuity mistake: The sheriff wears his badge over his left side, which is traditional. As he is approaching on horse in the final scene of the movie it is still on his left side. Then for a few seconds in one shot his badge is on the right. (01:23:10)
Continuity mistake: The Judge and son are standing by the side of the road and there's a black bag on the ground between them. When they leave there is no bag on the ground.
Continuity mistake: In the final police chase scene when Lou is getting out of the car to film the car accident, the left hand mirror of his car is intact at first then broken in the next shot.
Continuity mistake: Towards the end of the movie, when Alan comes out to Joan, there are a number of shots over his right shoulder. On the back of his jacket is a piece of lint that appears and disappears from shot to shot.
Continuity mistake: At the Dam Hydro Plant Caesar throws Koba on his back and pummels him. Then they roll once to the right, which now puts Koba on top of Caesar. Yet a quick-cut to their faces shows they kept Caesar on top, still pummeling Koba.
Suggested correction: It's Koba on top of Caesar in the first part of the fight. Caesar gets the advantage after the roll to the right.
Continuity mistake: The scene where Artemisia is seeing Xerxes off into the desert for his transformation is a flipped shot, note the two moles on her forehead. (00:10:30)
Continuity mistake: When they come over the mountain, Moses looks out at the Red Sea and sees nothing on the horizon. When they get across, they can see the mountains where they crossed very easily - the area on other side has mountains similar to the ones they crossed, which should have been visible when first approaching.
Continuity mistake: When Anna Kendrick visits Jennifer Aniston in the hospital it shows a cake from different views. When the views change the candles light and relight. (01:14:30 - 01:15:25)
Suggested correction: The candles on the cake never light and relight. They are always lit from the point when Anna Kendrick (Nina) lights them. In one shot they look unlit due to the pillow behind them but if you look closely they are always lit.
Continuity mistake: Throughout the film, Nicole Kidman's hair changes color. In one particular dinner scene, her hair is everything from light blonde, to dark blonde, to red.
Continuity mistake: Master Lui at his first appearance in the movie kills the traitor slicing his throat with burning tongs which he points right away at the eyes of the protagonist. Sammo Hung's grip on the tongs changes between shots. (00:11:00)
Continuity mistake: Carrie's height changes constantly.
Continuity mistake: Juana's dad buys her a bottle of lime juice hoping she can save time that way, not having to squeeze it herself fresh. She passes the bottle back to him holding it by the middle section in one shot, and by the neck in the next. (00:06:00)
Continuity mistake: In the scene where Tommy is arguing with Bob Crewe after the song "Trance", Tommy puts his arm up on the music stand while he argues. In the next shot Tommy's arms are now at his side. When the camera comes back to Tommy, his arm is on the music stand again. (00:49:50)
Continuity mistake: When the monk hands to the King the seal, he's holding it in different ways between shots (his right index is on the front of the seal in close-up, together with the middle in the next). (00:11:05)
Continuity mistake: When the guy is protecting his home and clearing the window with his shotgun you can see him breaking the glass on the bottom left window pane. In next shot it has the piece there again. (01:43:55)
Continuity mistake: During the early part of the movie, the left rear door of Doc's car is dented. For the rest of the movie, the dent is gone.
Continuity mistake: Rich is dangling a light bulb above his dad's head. When the camera shifts to a close-up of Rich, the light bulb is higher - almost across from his own face - but back to dangling above his dad's head with the next camera shift. This is independent of Rich's dad telling him to "hold the light steady." (00:06:23)
Continuity mistake: In the middle of a sentence, new text appears on the chalkboard behind the speaker, as well as new colouration on a globe behind him. (00:32:42)
Suggested correction: I've changed my mind about this entry. I realise now that these seeming errors are actually intentional, albeit hamfisted, visual manifestations of the changing timeline. I personally think this is a silly way to portray the changing of history due to time travel and the butterfly effect, but who am I to argue with how a fictional construct that seems to defy logic would play out. I'd remove my original entry but I don't see any mechanism to do that.