Just before Moe asks Larry how to spell "chrysanthemum," his clip-on tie falls off. When he is seen again being accused of stealing the shopkeeper's brooms, his tie is clipped on again.
After the Stooges have finished painting the floor of the art studio, they are standing in front of a brown door, which has been untouched by the Stooge's paint brushes, with several sketches hanging on it. When the cop opens the door in the next shot, the sketches that were hanging on the door are gone and the door is now painted black like the floor.
When the Stooges are attempting to help the distressed painter with the blotch of sunlight on his canvas, Larry has drawn a circle with a dot in the middle, while Moe makes an "X." However, throughout the next few shots, those brushstrokes disappear and re-appear on the canvas. It's most visible when Curly moves to the side and blocks the sunlight, then moves back (no strokes there), and also before Moe splashes black paint on the entire easel (strokes are visible).
The Stooges and a cop walk across a floor covered with wet black paint, but they leave no footprints on a white floor in the next room.
When the Stooges are in drag and "flirting" with the police officer, Curly introduces Moe as "My mother." As Curly says the line "And this is my mother," we see Curly's lips finish out the line but we don't hear it; only after the camera cuts to a closer shot do we hear the line finish.
When the film opens, Larry is standing on the street holding a sign in front of him that says, "Must have a job". As he turns to his right and raises the sign, the shadow of the boom mike can be seen at the top left-hand corner of the sign.
The cop chases the boys away from the radio shop where they were sweeping, but a couple of shots later, he's again chasing them down the same block.
In the studio, Moe points off camera and yells, "cop." The cop then opens the door and goes into the studio. Moe could not have seen the cop when he pointed and yelled cop.