Tom Sawyer: Anthony Cooper used the alias Tom Sawyer, a reference to the fictional character in several books by Samuel Clemens (pen name Mark Twain). Cooper jokes that he took the name because "Huckleberry Finn" was already taken.
Also, Sawyer leaves with Locke without putting his shoes on, most likely an homage to the fictional character who was almost always barefoot.
One of the best-known episodes from The Adventures of Tom Sawyer is the scene where Tom tricks other people into doing his work for him (painting a fence). Appropriately, in this episode Locke is the one playing the same kind of trick on Sawyer.