When the class are chased by the pygmy tribe a shot shows Cartman running with the group. Cartman at this point, however, had wandered away and was with the bulldozer workers.
The group gets lost in the jungle and Cartman decides to leave them. Immediately after he walks away, he's still seen in the group, noticeable by his hat and the unchanging number of children seen before and after.
When the children are tied up and sitting in a circle around a fire Kenny is sitting next to a brown haired boy, but in the next shot he is seen sitting next to Kelly.
The shop the bus passes in San José reads, "Farmesuticals Y Cervesa." It should read, "Farmacéuticos Y Cerveza."