Corrected entry: At the scene where locals have shown up to try out for the team, the potential players break out in a spontaneous version of the Eagles fight song, to demonstrate their loyalty to the team. The only problem being that they get the words wrong. The Eagles fight song begins "Fly Eagles Fly"; and the locals in the film sing "Fight Eagles Fight", which is how the second verse, not the first, begins.
Corrected entry: In the opening scene, the Eagles are playing the Cincinnati Bengals. However, the players on the field are wearing Cleveland Browns uniforms.