Continuity mistake: When Kyle and Stan show up to the Chili Con Carnival, we see in the background a woman with a little girl walking towards the right and Kyle and Stan at the left walking towards Eric's booth. When Kyle and Stan get there in the next shot, the woman and the girl are still walking, but they are in the same place as they were when the shot cut. This makes Kyle and Stan able to walk very fast apparently.
Add timeSol Parker
Plot hole: When Scott Tenorman shows the other kids a video of Cartman doing his "piggy" act, the angle of the video shot shows that it could only have been taken from the place where Scott was standing when Cartman originally did it - but Scott is seen at that time to have no video camera or any way to have recorded this.