Continuity mistake: When the Apes are trying to break into the mutant's church, Mendez looks towards the Alpha/Omega bomb, and is wearing a cream-colored jumpsuit with a purple sash. When the Apes do break in, his sash has disappeared. (01:25:50)
Continuity mistake: When the squad is crossing the cleared cornfield and encounters mines, each individual is forced to meticulously check with his knife and crawl individually to where he could follow Kelly's path. The cornfield surface all around is uniformly chewed up with moist dirt and lots of plant debris. However, when the German patrol shows up, the remaining soldiers escape along a well-worn, tamped path and the surrounding field looks dried out, smoother, and with much less plant debris. (01:12:00)
Revealing mistake: Iris' taxi stops in front of the Apollo. The street is pretty much empty, but once she is shown getting off the cab, there's suddenly cars, people all over the sidewalk and even in the middle of the road, pretty much everyone looking at the camera crew filming. (00:36:50)
Visible crew/equipment: When the police investigator is speaking with the man standing outside the store window and asks him if he would buy every tie in the store, in every close-up shot of the investigator, the reflection of the cameraman kneeling on the ground can be seen in his sunglasses. (01:08:25)
Continuity mistake: During Prince Rupert's first appearance, he greets his uncle King Charles I by doffing his hat and putting it back on. In the close-up shot he is holding his hat in place but in the wide shot his hand is on his side.
Deliberate mistake: When the family first entry Three Chimneys they have a single lamp as a light source. Entering from the door at the rear of the shot, everything in front of them should be in darkness to the viewer, but it's lit. Things in the background are lit even though there would be no line of sight to the light source. This is because lighting was added on set to allow the viewer to see things better, even though it ruined the realism.
Visible crew/equipment: When Mike and Susan prepare to start putting pieces of snow in the kettle, in the shot where Susan hands Mike the kettle, and he begins taking the lid off, the camera crew can be seen reflected on the kettle. (01:16:00)