The Beantown Bloggery

..... forces him to wear a New York Knicks jersey.

Thank goodness it's just for a movie, because he should really only be wearing Boston jerseys.
Here's what the Herald had to say:

Mark Wahlberg and funnyman Will Ferrell cheering on the New York Knicks during a game against the Boston Celtics while filming a scene for their new flick “The Other Guys” at Madison Square Garden

Click (here) for the original blurb.