Continuity: After Mrs. Russo puts Justin and Max in the lair, she is wondering if she should put the big lock on the door or not. She decides not to and puts the lock down on the counter. Two shots later you see the lock is back on the door, but unlocked. You never see Mrs. Russo put the lock on the door.
Great sites
Mistakes
In "Beware Wolf," Justin's shirt changes from the park, where it is a checked shirt, to his house, where it is a striped shirt, and again from his house back to the park. See more...
Wizards of Waverly Place mistakes
Continuity: When Alex spills a little chocolate, there should be a small puddle at her feet. But in the next shot, there is chocolate stretching right to the other side of the room. There is no way that the chocolate could have spread that far.
Revealing: In the wizards versus werewolves special, it's painfully obvious Juliet is a stunt double when she fights and grows her wings.