Continuity mistake: After the sheriff is killed Sam and Dewey leave to go to the hospital and it's daylight. On their drive to the hospital it's dark out. Then when they take Dewey's body out of the hospital and Gayle shows up it's suddenly light again.
Continuity mistake: When America and Wong jump through the Star Portal just before Wanda destroys Mount Wundagore, you can see they will travel to Kamar-Taj. However, when America opens another Star Portal to retrieve Dr. Strange from the destroyed universe, they are standing back on the snowy mountain top.
Continuity mistake: In the scenes where Ellie and Grant are flying to the Biosyn facility via helicopter - all the interior shots show them flying over a solid layer of clouds. However, in all the exterior shots of their flight, there is a not a cloud in sight.
Continuity mistake: As the "lone wolf" escapes on the bike, there's a fancy swooping camera shot which tracks him, cutting to a shot from the front just as he scythes between two dark cars and past a police car. In that quick shot a woman suddenly appears cowering by the police car who wasn't there before.
Continuity mistake: Before Abraham stands near the wooden cross, there are piles of wood and a blue/white water hydrant (?) behind him. When he stands and takes a step, only one pile of wood is visible. After he takes a few diagonal steps behind the cross and turns around, he is standing in front of his house that was not there. (The house should have been visible when he was sitting near the cross). (00:45:51 - 00:46:12)
Continuity mistake: When the roasted marshmallow landed on the back of the camper's head, it was relatively flat and spanned from the middle top to the right top/side with some charred marshmallow splattered almost to the center of the man's head. After a camera shift, the marshmallow was sticking up near the right top of the man's head, was shaped like a whole marshmallow, and was still largely white instead of mostly black/charred. (00:35:19)