When Larry is talking to Junior, Moe and Curly are seen in the background making spaghetti, but in the next immediate closeup shot of them, they are doing something else.
The Three Stooges place a bowl of spaghetti in front of the kid on his highchair. A later shot shows Moe getting hit in the face with a huge amount of the pasta; the immediate cut back to the kid in his highchair shows no bowl. The bowl didn't hit Moe, and there was no sound of it hitting the floor.
When Moe shouts the word "Scissors!" to Curly, Larry almost bursts out laughing.
When Larry says "I'm Sorry Moe!" after stabbing Moe with the scissors, his mouth isn't moving.
When Moe says "Lemme see now.", his mouth does not match the line.
When Junior burps after eating the radish, his mouth is not open.
When the cop is hit in the head repeatedly with the ironing board, his yells are dubbed in, as they do not match the movement of his mouth.
When Larry sets the bags of groceries onto the kitchen table, he accidentally knocks a book off it, and Moe puts it back on the table, but Larry again knocks it off the table.