Continuity mistake: In 2012, when Tony flies up inside the Stark Tower snooping on the Avengers talking to Loki, Loki delivers his lines faster compared to the original Avengers movie, and his movement is different too. (01:16:15)
Suggested correction: This doesn't seem to be a mistake as it would require a side-by-side comparison with the original film. Within the context of this film, everything fits.
Exactly. You could maybe get away with submitting this as a Deliberate Mistake, but since it's a scene from another movie being shown from a different perspective, it doesn't need to play our exactly as it did the first time. We'd just be watching that exact same scene from the other movie then.
No. The angle doesn't matter when the lines are delivered at a different rate.
Continuity mistake: When Steve starts fighting 2012 Steve, he places the case containing Loki's sceptre on the ground. He then starts to run towards 2012 Steve, leaving the case far behind him. The two then start fighting hand to hand, and the case is suddenly right beside them. (01:22:30)
Continuity mistake: When Steve and 2012 Steve fall down to a lower level of the building during their fight, they break a couple of glass barriers and floors, causing loads of shattered glass to surround them when they land. The compass with Peggy's picture is shown on the ground with glass surrounding it. The amount of glass shown around the compass changes between shots. (01:22:50)
Continuity mistake: When the Ancient One is showing Bruce the flow of time, a projection of the Infinity Stones are shown rotating around the flow of time she projects. Just as Bruce says "Because once we're done with the stones...", the projection of the Space Stone is shown rotating away from Bruce and more towards the Ancient One. The camera changes angles, and the Space Stone is now closer to Bruce, and is shown rotating past the same area it did in the previous shot. (01:24:30)
Continuity mistake: When the Ancient One is about to give Bruce the Time Stone, in the shot where Bruce says "So he must have done it for a reason", the Ancient One is holding the Time Stone, the two fingers she is holding the stone with are in a curved position. It then cuts to a different angle, where the two fingers are in a more straightened position. (01:26:00)
Continuity mistake: When Tony hugs his father, he places his chin down on Howard's shoulder. It cuts to a shot of Howard Stark, where Tony does not move his head. When the shot cuts back to Tony, his head is suddenly slightly lifted off Howard's shoulder. (01:46:10)
Continuity mistake: Just after Tony hugs his father, he says "Thank you for everything", before saying "you've done for this country" whilst turning his head away from Howard. The shot then cuts to Howard Stark, where Tony's head is suddenly facing more towards him. (01:46:15)
Continuity mistake: When Nat and Barton meet Red Skull on Vormir, Barton takes out his sword and points it at him. As Red Skull is saying their names, Barton's sword rotates itself by 90° in between shots. Note the position of the slits along the bottom and the pointed edge of the sword. (01:48:55)
Continuity mistake: When the Avengers return from the quantum tunnel with the stones, their order is Hulk, Tony, Steve, Clint. But seconds later this changes to Hulk, Steve, Clint then Tony. (01:55:18)
Continuity mistake: After Captain America gets hit by Thanos' sword he's pushed back to a log - in the next shot the log disappears. (02:14:09)
Continuity mistake: When Quill is fighting two of Thanos' henchmen, he is shown with a blaster in both of his hands. The second henchman is shot by Gamora and collapses on top of Quill. He then pushes the henchman off him and the blaster is no longer in his right hand. Quill removes his face mask and the blaster is suddenly back in his right hand again. (02:20:15)
Continuity mistake: In the final battle, Wasp and Ant-Man are in the van trying to get the quantum tunnel operational. We cut back to the fight and we can see Ant-Man there too, fighting in his giant form. (02:22:20 - 02:23:00)
Suggested correction: He needed to hot-wire the van. It's quite possible he could have left the van for parts (he's seen slamming a Leviathan to the ground) or to protect it. It also could have been an illusion by one of Dr. Strange's people.
Sorry but the suggested correction makes no sense. For one Dr Strange's people have no idea what Ant-Man looks like, and secondly Ant-Man would have no idea where to get parts from in the middle of a battlefield, let alone know if alien technology would be compatible. Also the time frame given when the scene plays out allows no time for him to leave the van, this is a legitimate mistake.
Dr. Strange's people don't know what Ant-Man looks like? He entered the battle with them long before they went to the van. Earth has had access to the same Leviathan parts since the original Avengers. If Toomes can make wings out of it in Spider-man Homecoming, it's possible he can figure something out. Clint had passed the glove to Black Panther before Ant-Man is seen in the background. There was plenty of time. He also could have been defending the van while they brought the glove.
There is plenty of time for Ant-Man to have left the van and returned to it. As the scenes play out, Ant-Man and Wasp are in the front of the van trying to hot wire it. The film then cuts to the battle for several minutes, as we see the passing off the gauntlet, which includes the brief shot of Giant-Man in the background. A few minutes later the film cuts back to the van and we see Scott opening the rear door of the van. So there's plenty of time for him to have gotten out of the van, saw potential trouble with the Leviathan, turned into Giant-Man to stop it while letting Hope finish activating the tunnel, and then returning to check the final settings. Now, all this raises another question that has to do with the apparent ease Giant-Man has in traversing the battlefield, as in why not just give Scott the gauntlet, have him turn into Giant-Man, take a few steps over to the van, and then shrink back down to take the stones back in time?
Continuity mistake: Just after Thanos knocks the Iron Gauntlet out of T'Challa's hand, he attempts to run over to it, but Wanda lands in front of him. T'Challa is standing in the background, a couple of meters behind her when she first lands. It then cuts to Thanos, but when it cuts to a shot panning in on Wanda, T'Challa has suddenly disappeared from the background. (02:23:10)
Continuity mistake: When Wanda lands in front of Thanos, the pendant on her necklace is around the centre of her chest. Thanos tells her he doesn't even know who she is. When it cuts back to Wanda, the pendant is suddenly more to the left. (02:23:15)
Continuity mistake: When Thor starts fighting Thanos, Thor attempts to reach for the Gauntlet in front of him. Thanos, behind him, grabs onto Thor, prompting Thor to turn around and swing his axe at him, which Thanos then grabs. When Thor swings the axe, the Gauntlet is behind him and the two never change position whilst they are holding onto the axe. But a few seconds later, the Gauntlet is suddenly in between the two of them. (02:28:20)
Continuity mistake: When Thanos gets the Iron Gauntlet, he has armour on his right arm. When he fights Captain Marvel, the piece of armour disappears from one shot to another so his arms are free to put on the Gauntlet. (02:28:45)
Continuity mistake: When Rhodey, Hulk, and Rocket are trapped under the building, Rocket is stuck under some rubble but has one arm free. The other appears to be pinned to his chest. When Rhodey pries the rubble off him, both arms are by his side. (02:30:03)
Continuity mistake: At the end of the movie, when Thor is speaking with Valkyrie about being the new Queen of Asgard, his beard is trimmed and much shorter. In the next scene aboard the ship with the Guardians when he and Quill are arguing about who is in charge, Thor's beard is back to how long it was earlier in the film. (02:40:20 - 02:41:45)
Continuity mistake: When Steve is telling Sam what happened after returning the stones, Sam asks how'd that work out for him and Steve says it was beautiful. Steve is looking directly forwards at the lake when he says this. When the shot cuts, he is suddenly looking at Sam. (02:46:20)
Continuity mistake: In the first Avengers film Steve lost his helmet after the battle and got dirty, with a damaged suit and battered face, but here while they are arresting Loki he has the helmet on and the suit is intact and clean. Can't be that he cleaned himself up, because in the Avengers post-credit scene eating shawarma (after arresting Loki), Cap's suit is still dirty from the battle. Can't be that he got changed before heading down (and why would he?) because in the shawarma scene from the first Avengers movie he's still in his damaged/dirty suit after everything.