Continuity mistake: When Lexy and Jake go to Lexy's house at the beginning, when Lexy sarcastically says "Thanks Michelle," she's suddenly standing several feet in front of Jake. But in every shot before and after, they're standing next to each other.
Continuity mistake: During the group therapy session right after the credits, when Lexy mentions the "layers and layers of secrets", the girl next to her goes from looking forward, to looking sideways at her between cuts.
Continuity mistake: In the opening flashback, when Dr. Mixture talks about how she "nods and prods" and then watches her patients' lives fall apart, her hands change positions between cuts.
Continuity mistake: When the living-doll version of Glen/Glenda/GG is revealed, after they thank Tiffany for giving them a makeover, the way they are holding the mirror changes instantly between cuts. This then continues throughout the rest of the scene, with them holding the mirror in a different way between shots probably a dozen times.
Answer: They were blamed for the death of Jake's foster brother, which was deemed a terrible accident, and they were sent to the reform school as a punishment. Presumably, when they had to leave the reform school given what happened, they were instead given community service as punishment.
TedStixon