An iMac g3 is used in a scene. The show takes place in 1994. The g3 was not released till 1998. The episode deals with fictional time travel in a story, but there would have had to be actual time travel for this product to be there.
Mark introduces Spencer to "Toni with an I," but the closing credits spell it as "Tony."
Amesh mentions The X-Files (1993) episode Folie a Deux (1998) in the library. This series is set in 1994-95, but that episode premiered in 1998.