In the beginning of the episode Ross is telling Chandler how to play tennis. In reality, Matthew Perry was a top-ranked junior tennis player.
In this episode we find out Rachel is 28. Yet she turns 30 four years later in season 7.
Terry, the owner of Central Perk, is mentioned here for the last time. His last appearance was in The One with the Baby on the Bus (1995).
The old woman who berates Ross through her door is voiced by Sandra Gould, who starred as Samantha's (Elizabeth Montgomery) long-suffering, nosey neighbor Gladys Kravitz in Bewitched (1964).
This episode takes place in Dec 1996, and the price of each box of cookies the little girl sells costs $5, which as of Oct 2021 equals $8.72. In 1996-1997, Girl Scout cookies cost on average about $2.75