This is the first appearance of Gunther, who makes an uncredited appearance in the background at Central Perk.
First reference to "Ugly Naked Guy." Chandler points out to the friends that Ugly Naked Guy got a ThighMaster.
This is also the first episode to feature Chandler's way of speaking, ie. Could I *be* more amused.
This is the first episode where clips of the show were put into the opening sequence. It was explained in the DVD commentary that just the fountain scenes made the friends look 'too cool' and clips of the show were added as it helped the audience familiarize themselves with the friends.
First appearance of the Geller parents, Jack and Judy Geller.