As Savannah skateboards down the sidewalk toward Jake and Murray (the dog), she loses control and flips over a bush out of sight. Her skateboard remains behind on the middle of the sidewalk about midway on a driveway where the two intersect. The next shot is a point of view from Jake looking up the sidewalk, but no skateboard can be seen anywhere near the driveway and sidewalk intersection. The following scene shows Savannah returning to the sidewalk, but now the skateboard is on the sidewalk near the right edge of the driveway rather than at the original midway point.
In the twin/swap story, when Savannah first assumes Emma's persona & returns home, her jacket is buttoned crooked. As she enters the room for her dress fitting her jacket buttons are no longer misaligned.