Having grown up in Indiana I'm kind of partial to Hoosiers.
I was managing a pizza place at the time of filming, and we got a call from someone pretending to be ordering pizzas for the cast and crew. Wanted 100 of them and we thought we were getting pranked. About an hour later, some guy pulls up to the door in a big van, jumps out talking on one of those old brick of a cell phones and we load the pizzas in his van and our delivery drivers car. Our driver got a $100 tip that night and got to see several of the actors involved.
Also in the opening scene, when Hackman's car is pulling up to the store, that's just down the street from my cousin's house. It's just outside the town I grew up in.