In one scene in Klink's office, two Gestapo guards are shown in black uniforms and helmets. In the next scene, supposedly moments later, they are shown in gray working uniforms and caps.
Wrong. In Klinks office the Major tells the guard to go get men to search the barracks. When they arrive at the barracks in the next scene, the guards are completely different people in completely different uniforms.
Wrong. In Klinks office the Major tells the guard to go get men to search the barracks. When they arrive at the barracks in the next scene, the guards are completely different people in completely different uniforms.
When the tunnel exploded, part of the camp and the barracks should have cave in to the hole. One scene after the blast shows men digging in dirt at surface level. The dirt at this location would not have been level with the rest of the ground, or the barracks floor.
When soldiers break through the floor, beams are visible from side to side. A moment later when they are digging dirt, the beams are gone and the dirt is near floor level.
In some scenes, there is a reflection in Klink' monocle of production lights.
On the map in Klink's office early on, Poland is clearly displayed and labeled as such, including its pre-World War II boundaries. The Nazis and Soviets, as per the Molotov-von Ribbentropp Non-Aggression Pact of August 1939, agreed to partition Poland between themselves, so a Nazi map of Europe would not display Poland.
Newkirk brings Gretel (the female spy) in the camp via a tunnel entrance, most likely the tree stump. When Gretel wants to show Major Hochstetter certain "trivias" in Barracks 2, like the tunnel entrance under the bed, she is discredited, since Hogan's men have previously detonated the tunnel and nothing of which Gretel says turns out to be true. However, all she had to do was to show Hochstetter the Treestump-tunnel-entrance, and Hogan's operation would have been finished.