Continuity mistake: When Ozzy spills the paint he is completely covered in it yet the floor below him is completely free of any paint. (00:19:05)
Revealing mistake: The clover patch is obviously just a green light being shone on the dirt. (01:16:15)
Continuity mistake: Early on, the leprechaun badly scratches Tory on the leg, yet later in the film there is no sign of damage. (00:30:15)
Visible crew/equipment: The wires that cause the suitcase to wobble are visible, especially when Mrs. O'Grady gets close to it.