I found 3 links (1,2,3) that have Mike Pelfrey as Santa Claus. Two of them have the same pic but the other has a short clip of him talking about the bullpen. I am hoping the Mets will put up a photo gallery on their website but I am not sure. I also found an article from MLB.com that talks a little bit about Joe Smith and the fact he was close with Mike Pelfrey and John Maine.
Let's Go Mets!