Revealing mistake: When we see shots of the Leprechaun inside the safe, there is much more room than when he exits.
Revealing mistake: At the start of the movie where the Leprechaun makes the guy float up in the air with the gold thing around his neck, if you look up the top of the screen you can see two wires holding him up.
Revealing mistake: When the leprechaun takes the golden tooth out of the homeless guy's mouth, the blank spot where the tooth was is actually just a tooth darkened to make it look like it was gone. You can see the tooth still in place.
Revealing mistake: When Morty dunks his head in the ice water bath, the ice cubes are not disturbed, which means that the ice is not actually in the water, but separated by a glass sheet. If they were, they would have been on the surface and they would have moved around much more than they actually did.
