Colors on the wall probably mean the posters that the dude is putting up.

Orange, Magenta and Cyan in that order from left to right.

Problem is... if that's not Orange - I'm on an uncalibrated monitor at the moment, then Yellow. So Y, M, C. The next poster is White, that's RGB (additive), not print like CMYK (subtractive)

I've looked at the Taxi Driver's dashboard... don't recall anything really being obvious to me.