In the scene at the end of the film when Nick and Mabel are putting the children to bed, the boom mic is visible on the left side of the screen poking out from behind the door frame just after Nick exits the room and Mabel is about to turn off the light.
In the scene where Nick first decides to have Mabel committed, he's got a towel on his shoulder and a bottle of gin in his hand. The next cut contains the towel, but no bottle of gin. The following shot the gin returns.
When Mabel returns from the Hospital, the family is in the living room watching Nicky and Mabel's father argue about dinner. Mabel sits on the chair with her father and kisses him. The camera tilts down and tape is visible on the floor. This is marking tape used to denote where to reposition the chair for retakes as the chair was moved earlier in the scene by Dr. Zepp.