Continuity mistake: Carter and Newkirk have just taken the escapees down the tree trunk to the tunnels. When they go to open it, they clear off the snow to open it. When the shot goes to a German soldier that was chasing them, the phony stump is suddenly covered over again. It would still have been visible, having just been exposed.
Continuity mistake: Hogan pulls a container with a red cross out of the drop box and opens it. It is labeled "penicillin" inside and contains among others several vials of clear liquid. Back in the camp, Hogan gives a box with a red cross on top to Kinchloe, saying "here's the penicillin." It is a completely different box.
Continuity mistake: After getting out of the tunnel, Hogan, Carter, and Le Beau are in a truck travelling to the meeting. Hogan in in the right seat, Carter on the left. But as the pull up to the meeting, they have switched sides, Hogan on the left and Carter on the right.
Continuity mistake: In Hogan's quarters, as he and Critendon are talking, his arms are by his sides, and suddenly crossed. As Hogan goes to get his hat off Critendon's sword, his right hand is shown, then after the angle changes, his left hand draws back with the hat, and his right comes up to grab it.
Continuity mistake: At the end, when Hogan and Schultz are admiring the Indian headband sent by Carter, Klink comes walking out behind them. As he stands in the door, you see Klink fold his hands in front of his waist as Hogan is talking. After Klink starts to talk, the camera cuts to a close up of him and he suddenly has his riding crop under his arm.