In the episode "Gotta Finish The Riff": When Judy Hoffs arrives in French class, she tells the teacher she transferred in from Riverside. Later, when she is taken to meet Reggie Brooks in the school office, she tells him she transferred in from Jefferson.
When Doug pulls up in the pizza truck, the camera crew is reflected in the driver's side window.
When Captain Briody informed the Jump Street officers that the program would continue to operate after the original plan to dismantle the program, he mentioned that the mayor finally decided that he was behind Jump Street program. In the pilot, Briody told Hanson that the program was the "mayor's baby".