When the prisoners convince Schultz that the Germans are losing the war, Hogan dictates a letter to Kinchloe that professes to the Allies that Schultz was a benevolent captor. Hogan asks that it be typed up and signed by all the prisoners. In the next scene, Schultz shows the letter to Klink, but it is all hand-written.
When Klink finds out the Germans might not be losing he takes the phony camera from the 2 RAF pilots posting as a Nazi film crew and attempts to open it to confiscate the film. Before the fail-safe can explode Hogan snatches the phony camera to dunk it in a water barrel. When he snatches it the camera is up near his chest, then the angle changes and the camera and tripod are already inverted before he has a chance to flip them.
When dunking the camera, the camera lenses are pointed away from Hogan and to his right (away from the camera shooting the scene) in the wide-angle shots, but pointed toward Hogan and to his left (toward the camera shooting the scene) in the close-up - essentially the camera is rotated 180 degrees as viewed from above.
General Kaplow is permanently out of uniform, as he is not wearing a necktie. Only the uniform type with the high stand-and-fall collar could be worn with a plain undershirt, whereas a tie was mandatory with the type of v-neck lapel shown.
The pennants on Kaplow's staff car are about twenty years dated - they are small versions of the Imperial War Banner (Reichskriegsflagge) used until about 1921. The Imperial War Banner used at the time the series is set can be seen on top of Klink's office.
When Newkirk is impersonating Hitler over the radio, he does it with an English accent.