[Rory climbed a tree to get to Lane’s bedroom window. Knocks.]
RORY: What’s up, Rapunzel?
Rapunzel is the title character in a German fairy tale, a girl with remarkable long hair who is kept locked in a tower by a witch she knows only as her adoptive mother. First published in the Brothers Grimm’s Children’s and Household Tales (1812), the story is based on a 17th century Italian fairy tale, and may be inspired by tales of Saint Barbara, whose father locked her in a tower, or even by pre-Christian sun goddess myths.
Rory is likening Lane’s situation to the well known fairy tale character, and saying that Lane is being unfairly imprisoned by her mother, just like Rapunzel.