When Jack Benny's character is putting up the roof on his convertible, during the first rain storm at the new/old house, he forgets to put up his windows. As a minute ago he was speaking with Mr. Kilbride.
At the end of the film when Jack and Ann drop into a hole in the ground, if you
take your TV remote and pause about two seconds before they fall, and then switch to super Slo-Mo on the remote...you can clearly see the faces of the stand-in actors who took the fall. Really neat!.