At the beginning of the series, Monica and Rachel's apartment number is 5, and Chandler and Joey's is 4. The apartment numbers were permanently changed and in this episode, Monica and Rachel's apartment number is 20, while Chandler and Joey's is 19. This was done to better fit the exterior of the building in New York City that was used to depict their apartment, which was several floors up, as apartments 4 and 5 could not be that high in the building.
This episode is included on the 2001 DVD release The Best of Friends Volume 3.