From ESPN.COM:
Because of the possibility of the Phillies hosting a World Series game Nov. 1, the NFL has moved the Eagles’ home game that day against the Giants from 4:15 p.m. ET to 1 p.m. ET. Normally Fox would be disappointed to lose such a marquee matchup for the afternoon game, but something tells me the network will “settle” for Brett Favre returning to Lambeau Field in the afternoon game.
If the Eagles-Giants game had remained at 4:15 p.m. ET, it could’ve created a situation where the game ended about an hour before first pitch at Citizens Bank Park. With the two facilities sharing a parking lot, that could’ve caused pretty significant issues.