Near the end, Gomer reads a letter from Goober aloud to Duke and Frankie; he's sitting cross-legged on the bench, with both shoes visible. But as he puts the letter down and starts opening the package, his legs are suddenly down and he's in his stocking feet.
Charles Aidman is billed as 'Captain Reiner' in this episode, but in the scene when Captain Reiner is speaking with Gunnery Sgt. Carter in his office-he is clearly wearing the rank of Major.