Other mistake: In the Super Bowl, both end zones are painted with the Vikings logo (you can see the far end zone as they go to kick the game winning field goal). One end zone should bear the Bills' logo.
Other mistake: In the scenes at the beach where Pumpkin is seated in his wheelchair, how did he get there? Someone would have had to push him there through the sand, but there are no wheel tracks or footprints.
Other mistake: All the baseballs used in the movie (or at least the ones you can see up close), were official Major League Baseballs. At the time the movie is supposed to take place, 1999, Rawlings made separate baseballs for the American and National Leagues. The official Rawlings Major League Baseball wasn't used until 2000.
Other mistake: In the scene after Jonathan and Aurora have sex in the gym, Jonathan gets on the company plane. You'll notice that he grows a massive beard overnight. Then, in the next scene, it's semi-shaved.
Other mistake: Every lake is frozen over enough you can walk on it except the lake where he falls. And he would have died of hyperthermia in 10 minutes or less, being wet.