When Jeannie & Tony are in the attic after Dr. Bellows goes downstairs, Jeannie blinks a sweater she was making on Tony. In one shot the sweater has no button on its right side collar. But when she blinks the sweater fully finished in the next shot, you see a black round button on the right side of the collar.
When Major Healy comes in and finds Dr. Bellows laying on the couch the door doesn't fully close behind him then after some close up shots it has been closed.
When Tony is explaining to the General about writing lyrics for a song there's a shot zooming in on the sheet music on the piano and Jeanie's bottle isn't on it. Then when we see Major Nelson playing the piano the bottle is there and you can see a lyrics sheet that wasn't there before.