Before Moe begins testifying his necktie is loose (stock footage). In the next shot his tie is neatly knotted (new footage).
Larry's hat mysteriously disappears when Hookup pushes him to the stove.
Joe flubs the line "Sunny side over" instead of "Sunny Side Down".
When a soot-covered Moe chases Larry and Joe with the ax, he stops for a couple seconds due to it being in his eyes.
When Larry's trombone slide flies off and into Moe's neck, you can hear the kettle drum sound from Idiots Deluxe, even though Larry does not play it in the new footage.