Continuity mistake: As Schultz takes the balloons away from Hogan, Newkirk is nowhere to be seen. A second later, he witnesses the entire scene.
Continuity mistake: As Klink asks about the forecast, his hand is around the microphone end of the receiver, then a moment later it's around the handle.
Audio problem: When Klink comes into the barracks, he puts the bottle of alcohol into his jacket to hide it. When he does, you hear a distinct clink (no pun intended) of glass on metal. None of the POWs wear anything that would cause this.
Continuity mistake: After Hogan calls off the volleyball game to go see what Kinch wants, he goes into the barracks. From the outside, the door is already open. When the camera shot is indoors, Hogan is opening the door again.
Continuity mistake: When Shultz comes out of the NCO Club, he bumps into Klink. After yelling for a moment, Shultz talks with Klink. While talking, Klink has his monocle on. After taking a couple of steps past Shultz, he turns around and addresses Shultz again; when he does so, you see that the monocle is missing, without being taken off.
Continuity mistake: When out at the volleyball net, Hogan is called by Kinch. While walking in, Hogan's hat is positioned as normal. When the shot is inside, the bill of his hat is down shading his eyes, and he pushes it up into its regular position.
Continuity mistake: Before Hogan lets Klink have the ball to hit, the camera does a close up on the volleyball. It can be seen to be a dull light brown color. After Klink hits it, and it soars up into the air the camera cuts to Hogan and Klink, and back again. When it does the ball is now a shiny orange like color.
Answer: It's a solitary cell. Steve McQueen, star of 'The Great Escape' is known as the 'Cooler King'.