Honestly, I don't even remember this... hence the "really?" bit of my first reply to this thread. I mean that, generally, this kind of mistake annoys me, and I start ranting.
If he got the colours wrong, it's a blunder, unless the writers were trying to make a point. If they were, then it must have been an obvious one. If it wasn't obvious, it was probably a mistake.
So...yeah. Stuff like that make me go all CALL A WAAAAAMBULANCE, because I am horribly pedantic. Maybe they didn't even get it wrong and I ranted for nothing.