RutgersSam,
The shuttle that you want to get on is by the student center on College Ave. Those buses move out quickly because they are immediately filled. You can get a shuttle on Albany St. (Route 27) near the train station, but not that many people use that location. That bus doesn't leave until it is full, so if you plan on heading to the game early, you might be sitting idle on the bus until its at capacity. A buddy and I went to Brother Jimmy's for grub and made the mistake of getting on this shuttle. We waited about 20 mins before it left for the stadium. All the shuttles drop you off in the same spot, right in front of the stadium in Johnson Park. Old Queens Tavern usually runs a free shuttle from their location if you want to tip a few drinks prior to the game. If its a close game (hopefully), you will find the shuttle back to be quite the experience.