In Intruder in the Dust, before Jake Montgomery became Vinson Gowrie's partner in the timber business, he owned "a place he called a restaurant just across the Tennessee line" from Mississippi (112). We identity it as a 'Bar' rather than a 'Restaurant': according to the Sheriff, what Jake served didn't need to be "chewed" or cooked, but came from "a hole under the floor big enough to hide a case of whiskey in" (112-13). After a man "got killed in it one night two-three years ago," the Tennessee police closed it down (113).
The "State University" where Gavin Stevens goes to learn law in this novel is almost certainly the same one he attended in Light in August: the University of Mississippi rather than Mississippi State (3). The University of Mississippi, of course, is in Oxford, Faulkner's home town and the place on which his imaginary Jefferson is closely based.