Continuity mistake: When Tony and Pepper hug after reuniting on Earth, Pepper's hair is resting against her back. The camera changes angles and there is suddenly a huge lock of hair going over her right shoulder and down the back of it. (00:09:24)
Continuity mistake: The length of Thor's beard changes multiple times throughout the movie, and not consistent with the passage of time. For example, when talking to his mother, the beard is ~4" long, but soon after, when talking at the lake with the others about Nat's death, his beard is 7-8" long.
Continuity mistake: Before Wanda hits Thanos she has dirt on her neck then it's clean.
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 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 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: 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 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 returns to Earth, Pepper approaches Tony and starts to hug him. In the shot focusing on Tony, his chin is shown pressed against her shoulder, and then he lightly closes his eyes. When it cuts to a shot with Steve in the frame, Tony's eyes are more clenched shut and his face is more pressed against her shoulder. (00:09:24)
Continuity mistake: When Rocket, Hulk, and Rhodey are trapped underground, a water pipe bursts, and they nearly drown. There is a shot of the three of them with only a few inches of air left. Ant-Man comes and pulls them out, but when they reappear on the battlefield, they're dry. There was at least a few minutes between when we last saw them and when they reappear on the battlefield because Rhodey has a new suit. However, it was not enough time for them to dry completely. Hulk's hair is a little damp, but Rocket's fur is bone dry and fluffed up.
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.
DetectiveGadget85
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?
Vader47000