Continuity mistake: When we are in the lounge of the haunted house at the beginning of the short, there is nothing on the round table, but in the very next shot some playing cards are now on the table.
Continuity mistake: When Mickey is knocking on the door of the haunted house, the door has two bottom panels, but when the door crashes to the floor, the panels are missing.
Continuity mistake: When one of the ghosts scares Donald with chains, Donald takes his net with him when he jumps off. When Donald dives into the chest of drawers in the next shot, he has no net.
Continuity mistake: When Goofy searches through the dresser drawers one of the ghosts causes trouble, then Goofy breaks through the top of the dresser and winds up trapped inside, but when all four ghosts appear the dresser top is perfectly fine and that damage has vanished. Also, two of the drawers (one large and one small) fall out of the dresser, but as the four ghosts are pushing the dresser those two drawers have reappeared in their proper places.