(at around 3 mins) After the magician gets electrocuted, the hat shoots off his hand across the stage. He then furiously chases after the rabbit and he noticeably does not have the hat with him. However, when the rabbit runs under the table, the magician is now holding the hat again.
(at around 50 secs) When the magician opens the secret drawer to reveal the two hats, his hat is on the right while the rabbit's hat is on the left. But when he takes the hats out of the drawer, they have swapped places.
(at around 4 mins) When the magician is falling, he is already fairly close to the ground by the time the rabbit notices him. But then he is higher up when the rabbit moves the hat to save him.
(at around 3 mins) As the magician gets electrocuted, the broken ladder is still shown to be on the stage but when the musicians begin playing, the ladder disappears.
(at around 1 min) While testing the trick before the show, the hat on the rabbit's head shifts perceptibly to the left just as the magician's hand enters the top hat.