This is the only time where a different camera angle for the staircase is seen, when they are trying to push up Penny's furniture.
The guys mention that they are having a Superman movie marathon. Later in the episode, upon seeing how messy Penny's apartment is, Sheldon exclaims "Great Caesar's Ghost!" which was Perry White's catchphrase on Adventures of Superman (1952).
Leonard mentions his collection as having 2,600+ comic books.
Sheldon is shown as having possible Obsessive-Compulsive disorder and trouble understanding sarcasm.