Glenn discusses how the part was based on him in this interview with Sports Radio Dan Patrick. He also talks about being cast by Cameron in Jerry Maguire.
I watched this interview a lot before Glenn passed away but haven't watched it since. Just a great indication of the interests that Glenn had outside of music.
https://www.youtube.com/watch?v=kUcncHXnlVE Part 1
https://www.youtube.com/watch?v=5tdzbgEDQyM Part 2
The discussion about the movie is at the start of Part 2.