During Dewey's speech at the wedding show, the letter in Hal's hand changes places. Sometimes folded, sometimes not. Sometimes between first & second finger, sometimes between thumb and forefinger.
Lois (giving birth) passes the 'phone to Ida. Piama holds Lois' right hand in her left then with both hands then with the left hand only.
Hal, on a step ladder offers up a hammer to Francis on the roof. In one shot the hammerhead faces to Hal's right. Then it faces to his left.
Hal, on a step ladder offers up a hammer to Francis on the roof. Between shots his grip on the handle changes.
Lois & Hal walk in to announce the proposed inducement of labour. In most shot, Malcolm's right arm is on the table. In one view from behind, it's not.