Scrappy

Other mistake: When Fred and George pass on the Marauder's Map to Harry, we see the map start to reveal itself. As it does Harry starts to read "Messrs Mooney, Wormtail, Padfoot and Prongs." Harry reads the word Messrs before it even appears on the page.

Scrappy

Continuity mistake: During the scene in which Uncle Vernon's sister Marge is turned into a balloon we see her floating out of the conservatory. A second before she is blown out the door we see from the shot looking into the conservatory that Aunt Petunia is to the right of the conservatory doors inside the dining room. When the shot changes, she is now standing in the doorway to the conservatory.

Scrappy