During the very last mission, look next to the door to the Hall of Villains to find an entrance to the ventilation system. Find a detached grate leaning against the wall. The opening seems to lead abruptly to a dead end, but you can head inside and turn to the right to enter a room with a statue of a man wearing a Captain Qwark t-shirt. This man is the late Dan Johnson, a former member of the Insomniac team. Stand on the platform in front of the statue and hold the Tourbot to hear a recorded memorial message that pays homage to Dan. References to him have appeared in previous titles within the series as well.