Reminded that when the Yankees were busy sucking in the late 80s/early 90s, Crystal was wearing a Mets cap in his movies, I found this post from "xmulderx" via the Google:
I go back and watch some Mets games i do have on tape from the 80's all be it on betamax yikes. I am surprised that thing still functions. But there are atleast a couple of ocassions where robin williams and billy crystal are in the booth calling the game for a couple of innings. When asked who there favorite team was: Billy Crystal says the Mets are by far his favorite team, while Robin Williams says he is a big giants fan. I realize he is a yankee shill it seems in recent memory, but he is a phony yankees fan. There was a reason he wore a Mets cap in City Slickers aswell. He is a clear case of a bandwagon fan and a disgrace to both teams fanbase.