High School Musical - Sharpay the Illusionist
This Slip-Up is in the "Status Quo" scene, around half way through the song when Sharpay screams "EVERYBODY QUIET" and Gabriella enters the scene and talks to Taylor. When the group starts singing again, Gabriella starts walking through the dancers with her tray and you see Sharpay start to walk away from Ryan. Then, in the very next camera angle, you can see Ryan and Sharpay still standing in the same spot overlooking the cafeteria. Then, in the very next angle after that, they're both walking down the stairs...it's like magic!