When Poseidon is sent to the Fox River State Penitentiary, the prison cells are black, with white numbers against the gray wall and ground floor only. However, in the next scene, the prison cells are different, with gray colors, the handrails are yellow and there are three floors. At 00:42:30, John Abruzzi and his former right hand man, Gus Fiorello, can be seen. The scenes are taken from Pilot (2005), which means that archive footage was used for this sequence.
Before "Poseidon" entered his secret office with Mike Scofield, he was wearing a black shirt, but after he went in it turned to be a blue checked shirt.