In the episode where it's the first snow of the season, 3 kids throw snowballs at a city bus that is blue. Then, the bus driver screams "We're all gonna die!!!" because he can't see through the wind shield. He crashes, and then look at the color again, it's a blue color still. Then in the next scene, if you look waaaay down the street, you'll see a crashed bus, but it is yellow like a school bus. Wait, because later in the show you'll see another bus, yet it is that blue color. Geez, we didn't need someone to paint the bus at light-speed.