Continuity mistake: In the opening titles (for series one, two and three), Cartman, Stan, Kyle and Kenny get on the school bus. Stan is on the fifth row, Cartman is on the sixth row, Kyle is on the seventh row and Kenny is on the eighth row and there are another two rows behind them. But in the shot after Cartman says "Everybody day and night! People shouting howdy neighbor!", Kenny is now on the back row.