Continuity mistake: In the beginning when Morton and Greg meet the drug dealers at the harbor, look at the big rig that is hooked up to the trailer. In the first few shots the truck brand is a Volvo, then when the truck drives away, it's an International.
Continuity mistake: During Stoick's funeral Hiccup first shoots an arrow towards the ship and then the other characters draw their bows. Gobber is not shown as he is further away. In the next shot where they shoot their arrows, Valka and Eret are suddenly further apart from each other and Gobber has moved closer in between them. Eight arrows are shot simultaneously, but only seven arrows rain down.
Continuity mistake: The necklace Stefan gives Maleficent appears and disappears as she is flying around the Moors. This is just after she gets the true love kiss.
Continuity mistake: Nick Fury's black SUV gets hit by several police cars - the driver's airbag deploys and is visible in all shots until the SUV eventually escapes, at which point the airbag has disappeared.
Continuity mistake: In the scene where Ava shoots Damien, she has no bra under her sheer nightgown in one shot and then has one when she goes to the window in the next.
Continuity mistake: Soon after Jane meets Stephen at the beginning of the film she writes her telephone number on a napkin. Later when he looks at the number it is written much more clearly.
Continuity mistake: In the scene where Logan carries Veronica into her room and covers her with the blanket, she is fully clothed. When she comes out to ask him, "don't go," and then kisses him, she is not wearing pants and has a different shirt.
Continuity mistake: During the battle with Green Goblin, when Gwen Stacy is falling through the clock tower, there are dozens of gears and other pieces of various sizes falling with her. However, when she lands, only a few small gears and pieces land alongside her - all the other debris that were falling have seemingly vanished. (02:01:20)
Suggested correction: That part of the scene is SO dark that it's really hard to tell; they do show some gears and pieces land after she does and there are some gears and pieces next to her when he walks to her. I wouldn't say there's none, but I'd say it does seem a disproportionately low amount considering how many giant gears were falling.
Given that even you admit in your correction that the number of gears seems disproportionately low (which it is - we only see a few small pieces landing when there were dozens and dozens of pieces in different sizes falling), I think amending the wording through a word-change is a better option than trying to correct the mistake itself. Because there is still a mistake here. Going to go ahead and do that after I post this response. (Might take a few days to change, though).
Continuity mistake: When John first meets Marcus in the cemetery, John's umbrella changes from a standard 8 rib when lowering the coffin, then a 22 rib close up, then back to 8 ribs in a far shot of the two men shaking hands. (00:04:15 - 00:05:45)
Continuity mistake: Just before seeing Principle Celestia, and they are walking down the hallway, the cutie mark on Sunset's shirt disappears.
Continuity mistake: When Justin is disguised with the dread locks, one of the body guards gets into a fight with him. Justin is punched hard in the face in slow motion, the impact of the fist shown to hit below Justin's cheek on his jaw. Yet the next day Justin has a huge red mark above his cheek on his temple.
Continuity mistake: When Max is on the train, after finding out about the stitcher, he's next to a poster ad that has people in it. After the shot of the couple kissing, the poster ad has changed to just having words on it. The person standing next to the seats changes too, and then in the final shot is gone. (00:21:55)
Continuity mistake: When Cathy is duct taped in the SUV the tape is around her body, but when the SUV crashes she gets out and there is only duct tape around her wrists.
Continuity mistake: Federov is pointing a Wather at a kneeling Mira. In the next shot his gun switches to a Sig-Sauer and then back to a Walther. (01:12:55)
Continuity mistake: When she is watching General hospital, the baby in the crib has no shirt on. When the TV goes off and the baby is crying the child has a shirt.
Continuity mistake: After Aaron extracts the capsule out of his butt, when he shows it to Dave he is either holding it pointed upwards or horizontally, depending on the shot.
Continuity mistake: When Quicksilver duct tapes the guard in the elevator, the tape changes when Quicksilver and Magneto come back. For example, when they get back, the tape on the chin is now tucked under tape strips and there are more spaces seen.
Continuity mistake: When Surley is in the tree getting ready to lower himself to the nut cart, after dropping Buddy in the bucket, he puts a spool of thread onto a small branch and there is nothing else on the branch. Next shot, there is a clothespin on the branch behind the spool that he moves to the front to hold the spool in place.
Continuity mistake: In the scene at the college where Callaghan asks to look at Hiro's Megabot, Callaghan's shirt is blue, but when he holds out his arm to take Megabot, his shirt sleeve is red. Later on he is wearing a red shirt at the SFTT. (00:13:30)
Continuity mistake: When Classified is telling the penguins about the North Wind as Skipper eats the Cheesy Dibbles, the amount of cheese powder on Skipper's feathers differs between shots.