The song "Morning's Here", sung by Joey's neighbor in the opening and closing scenes, is actually a vocal version of Chuck Mangione's 1977 instrumental hit "Feels So Good".
When Chandler sees Ross looking depressed, he asks him "you alright tiger?" Chandler asked the same thing of Rachel when he found her sitting on the step looking depressed in The One with the Two Parties (1996).
The Magna Doodle says You Snooze You Loose
In comparison to the last time Monica and Rachel bet the apartment with Chandler and Joey, Phoebe is the judge of the contest instead of Ross, who is absent, while the roles were reversed the last time in The One with the Embryos (1998) (S4E12).