Not sure if it's true, but I like to think "Lightspeed Briefs" is a joke based on Fruit of the Loom (at least for a while, stylized as "FTL" in their branding).
FTL is also used as an abbreviation for "faster than light" in sci/scifi discussions of exotic methods of fast travel.
Bizarrely, I remember there was more to this dream sequence. After he runs through the hallway towards the camera, shot switches to Rivers running in dark mist saying "I need to find the exam!" The mist evaporates revealing students in stadium seating in an auditorium, and Nick asks if this was the physics exam, and the response is "where have you been all semester?" and someone else asks, "where are your clothes?" before the mist returns to white out, and then Nick wakes up relieved he's only being tortured by Nazis.