When Moe rips off Curly's surgical mask, he is not wearing any gloves, but in the next shot, he has one on his left hand.
When Curly kicks one of the dog-nappers, his jacket is only in one arm, but in the nest shot, when he's on the chair, his jacket is on the whole way.
During the dinner scene, Curly takes the lid on the tray off, twice.
Larry's unconscious body changes from laying flat on the floor to sitting up against a wall, in another shot.
When Moe squirts soap in Curly's face it comes out before Moe touches the dispenser.
When the decoy dog keeps signaling the Stooges to move back, Curly's hat accidentally falls off, but he catches it.
When Larry tries to apologize to Mrs. Bedford about losing her dog, the actress unintentionally cuts off his line.
When Curly crashes through the wall of Mrs. Bedford's house, the actress can be seen smiling, before her character is supposed to faint.
When Curly says "I can't see! I can't see!" when Moe pokes him in the eyes, you can see Curly opening his eyes briefly.
Throughout the film the Stooges and the rest of the cast has confusion over Garcon's gender. They either call the dog he or she.
When Mrs. Bedford's maid tells the Stooges to wait in the living room you hear her voice but her lips don't move.
When Curly says the line "One little kitten lost its mittens.", his mouth is not moving.
You can see a shadow moving on the wall when Curly is trying to pull the thorn out of Garcon with pliers.
You can see the strings holding up the decoy dog's tail to motion the Stooges, when they follow him.
When the Stooges are ready to operate on Garcon, Larry is the only one with a surgical mask on. Why is Moe and Curly not wearing one?