While on the street outside the bookstore, a male extra with long hair wearing a cap, comes toward the camera. Watch closely and you will see his reflection in the window walking toward the camera again. Later, when Brian is encouraging Justin to walk toward him, the same extra can be seen passing Brian, then he is behind Justin walking and when the camera closes in on Brian again, he's continuing behind him.
A sign with a phone number can be seen in the scene where Justin is walking to Brian on his own, however it has the 416 area code of Ontario where the show was filmed instead of Pittsburgh where the show is based.