Ok...I've always wondered about this....
The coach personally went to see Henry play in high school (the only time the coach recruited a player on his own I think the movie says) - and obviously liked what he saw.
Then, when Henry has trouble fitting in with the team, we see the coach looking at game films of Henry...and HATING what he sees. He says something like "Turn it off - I've seen enough hotdogging".
Why did he like what he saw in person, and made Henry all the offers (car and scholarship), but then later on, he hated how Henry plays on the game films he was watching???