Revealing mistake: When Nica goes up the ramp and into the truck, her dress is bunched up, revealing her legs are hidden inside (she's supposed to have had her legs chopped off). Additionally, you can see that a blur has been added over Nica's face to mask the fact it's a stunt-person doing it.
Revealing mistake: When Nica is escaping, there's a dramatic shot from behind where she comes from over the camera, lands, and zooms away. For a split second, you can see actress Fiona Dourif's hands covered in black gloves as she's spinning the wheels on the wheelchair. Nica's arms have been chopped off and replaced by prosthetic arms with hook hands but they shot the scene with Dourif wearing black gloves underneath. The camera happened to catch them in this one shot.
Revealing mistake: When Glen and Glenda walk up to Jennifer and kiss her on the cheeks, Glen noticeably "shifts" unnaturally when they lean. Later in the shot, they "glide" somewhat as they start to walk out of frame. Since Lachlan Watson played both characters and filmed them separately, it looks like they had to digitally shift Glen around in the frame a little bit here and there. It's easy to miss, but if you know when to look, it's noticeable.
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