Joliet is holding flowers while in the dungeon. When Koopa enters the cell after throwing Mario, Luigi, Toad, the princess, and Romeo, the flowers are nowhere to be seen. Then when they plan to escape, Joliet has her flowers back.
When Luigi asks Pietro Mario about a birthmark, the pizza and condiments on the table change positions between shots.
During the visit with Pieteo Mario, the pizza on the table changes from whole to missing a slice between shots.
The camera pans outside the dungeon door as Mario discover's Koopa's super troopa Grunt working out. When the 3rd door to the right show, Grunt appears out of nowhere in the next frame.
When Toad is insulting Grunt, the dungeon door changes colors in the close ups from red to pink.