Hogan poses as a German general and enters a heavily guarded hotel. In a feigned rage, he threatens the German guards and breaks vases and lamps in the lobby. There are two large gold-colored vase on the floor near the stairway. He picks up the first one and smashes it, then picks another one up from a nearby table and smashes it. In subsequent shots, the second vase by the stair is no longer seen. After Hogan leaves the missing vase is now lying on its side in the lobby.
In the first scene, the posts of the bunk bed by the door extend above the top bunk in the wide shots, but in Newkirk's close-ups the posts are level with the bunk.
Hogan and Newkirk arrive at the hotel and introduce Hogan as a phony German General. The soldiers perform the "Heil Hitler" salute but the camera angle changes and no one is saluting.
In the hotel lobby, after Hogan enters dressed as a German general, one of the German soldiers in the background gives the Nazi salute left-handed. Seconds later, the same soldier gives it again, correctly right-handed.
The group forms a bucket brigade and is emptying buckets of water into a barrel. They come up with the idea for Hogan to pose as a German General to free the scientist's daughter from the Nazi's and Hogan puts on a fake accent and barks out fake orders. Newkirk drops his bucket into the the barrel and you hear it striking the bottle, indicating the barrel is empty or nearly empty, because if it had water in it you would hear a splash.
When Colonel Hogan uses the secret periscope it is shown outside hidden in a barrel of water.
Even though it is Winter outside the water in the barrel is not frozen.
Hogan, as the German General, wears a monocle in the right eye. There are reflections from the production lights in the monocle.
There are reflections in Klink's monocle from the production lighting.
When Hogan (as General von Himmelberger) goes to the hotel, and there are several guards and officers there, there is no way they would have believed that a General on the Führer's staff would be traveling in a motorcycle with a sidecar, and with only one staff assistant with him (driving the motorcycle).
Hogan states that Altman has never met DuBois. There was never any indication of this condition up to this point.
Just after telling Hogan who the civilian is, Schultz plays a hand of Blackjack in which he gets a Blackjack. When he reveals the hand, as the scene fades, everyone shoves their chips to him. Blackjack is not a form of poker. In Blackjack, only the dealer pays winners and collects from losers. Only Newkirk should have paid Schultz.