Wrong

This nitpick is absolutely incorrect. Jerry's couch he was replacing was blue. If you watch the pee episode again, it starts off in a furniture store where Jerry buys a new, either grey or white, couch. It's then moved into his apartment where Poppy allegedly pees on it. (I say 'allegedly' because I don't feel it's right to scorn Poppy's good name without much more valid evidence of pee. As we've seen in a prior episode, Poppy is VERY hygenic. *joke*) Upon Jerry finding the pee, George takes the couch and when it's replaced in Mr Pitt's building, it is the same couch that the "accident" occured on. Jerry's couch, however, remained blue.