When the president of the United States is on the phone, he sits at his desk with his back turned to the window. When Mario is making the super drains to pump the water out of the white house from the oval office, the president is facing the window while on the phone and the desk changed positions as well.
The princess with Toad and Luigi arrive at the entrance to the white house on a boat. In another shot, the boat is further away from the entrance.
In the first shot of the boomerang brother filing Kootie Pie's toenails, he's orange. In the next shot, he's back to his regular green color.
In the shot when Kootie Pie is on the ground having a tantrum as Mario uses King Koopa's ray gun to take her back to Koopa's castle, the ring around her shell is pink instead of white.
Right as Mario dropped the White House from the tractor beam, Kootie Pie, on her lawn chair, was clearly seen crushed underneath. In the immediate next shot, she is seen as though she and her chair had never been crushed.
In the beginning scene, right after Kootie Pie kicked her cake out the window, her mouth doesn't open as she whines in her tantrum.