Continuity mistake: When Don Knotts is in the old Simmons mansion, he falls down a chute of some kind. If you watch closely you will see the stunt person looks nothing like Don Knotts. It is a younger man with very straight hair.
Continuity mistake: Before Owen leaves her to go work, Willie licks the cone in the close-up, and it's messy and dripping. Cut, and not only she is not licking it, but it's also nicely in shape and not dripping down the pastry. (00:36:05)