Tammy's shoes disappear after she goes down the stairs behind the hotel. She has them on again when she and Scott are searching the pawn shop. How did she get them back?
In Leprechaun 2 the Leprechaun is affected by a wrought iron safe but in this movie he opens a safe with no problem and is not affected.
Scott's hair when he goes to confront Mitch in his hotel room.
When the Leprechaun is shooting craps one of his dice leans against the back wall at an angle and the dealer declares him a winner. However in real life this is not a valid throw and couldn't be a winner.
The pawn shop owner blinks when Scott flips over his corpse.
The tongue that Scott sticks out in the hospital is obviously fake as his real tongue is visible underneath it.
The boom mic is visible when the Leprechaun is outside the Golden Nugget Casino.