When the goldfish bowl tips over onto Shemp there are water marks on the walls in the corner possibly from previous takes. Next scene the water marks are gone.
When Shemp starts reading the probate article in the newspaper the page with that article is facing the camera (albeit upside down). Next shot we see a close up of the article. Next shot the page has changed and Shemp is reading the page previously seen facing the camera.
Larry's stunt double can be seen when The 3 Stooges run from the Lion.
The glass separating the Stooges and the lion when they are in the crate is visible.
When the train porter says "Help, I'm losing my mind!", you can hear the actor laugh.
On the side of Slipp's office door after he knocks out Larry.