Continuity mistake: Charles enters Col. Potter's quarters while Potter is sleeping. Potter sits up in bed while Charles whines and complains about his sister's engagement. In all the shots facing Potter, the hair at the top of his head is very messy and pointing up. In every shot facing Charles, Potter's hair is normal.
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Continuity mistake: When Klinger refuses to give Winchester the letter from his sister, Winchester screams at him, Klinger jumps and falls to the ground next to Winchester's bunk. After the cut, Klinger is sitting next to Hawkeye's bunk (note the airplane seat in the background instead of the door) and Winchester is holding the letter in his hand opening it. Rightfully it should be on the floor next to Winchester's bunk. If you look closely, you can see it flying out of Klinger's hand towards the door.