Pablo's school bus indicates it is from the Willoughby-Eastlake City School District, a suburban school district, but central to the plot is that Pablo is being bussed to an undesirable inner-city public school. (The director of the film noted that "it was just a bus we could rent".)
When Don tries to call his girlfriend Susan from the pay phone of the Severance Hall changing room, he inserts a dime into the telephone, then hangs up after several rings without anyone picking up on the other end. The telephone should have returned his dime to him, but instead the phone banks the dime.