Errors made by characters (possibly deliberate errors by the filmmakers): One of the children talks to a girl about World of Warcraft. He said he was a level 40 Blood Elf Druid. There's no such thing. Only taurens and night elves can be druids.
Revealing mistakes: When the school bus hits the bathroom, it is obvious that there are no children in the bus even though it's supposed to be full.
Continuity: On the first day of pick up, the wiper on the passenger side of the bus is broken in one scene and fixed in the next. The wiper alternates from broken to fixed between several shots.
Continuity: The first day Buck takes a group of children - including Juliette - into a wood trip. At the same time there is a rumble in the camp between all the other children. You can see clearly in one shot that Juliette is also one of them. A few minutes later Buck and his group of children return to the camp bringing along with them Juliette with same clothes as in the rumble scene.