Final appearance of Ross' original apartment.
The Magna-Doodle says "WHY".
This is the first episode of the fifth season where Monica and Chandler's relationship is not a part of any of the storylines. However, it is still alluded to in a small scene at the beginning where Joey urges Monica and Chandler not to make out in his apartment. Later in the coffeehouse, after Joey tells Ross that Emily is being unreasonable, he subtly implies to Monica and Chandler that he would have told Ross about the affair, saying "Well, I'm keeping so many things to myself these days, something was bound to slip out!"
Phoebe's boot knife is never mentioned/acknowledged after she sets it down and leaves it.
This is one of two episodes where the lobby of the apartment building is seen, the second is in "The One with All the Cheesecakes" (S7E14). Similarly, this is the second of two episodes where the basement of Monica, Rachel, Chandler and Joey's building is seen, the first was in "The One Where the Monkey Gets Away" (S1E21).