When Lauryn dances onstage at Ruby's for the first time, as she goes into her starting post, she realizes that she is too far to the left (viewer's left, her right) of the stage and adjusts herself so her silhouette (outline) is right in the middle of the sliding stage door (at the line where the doors meet). But the very next shot shows her silhouette to the right (viewer's right) of the middle/door split.