Bruce Willis agreeing to guest appear on Friends was because he lost a bet to Matthew Perry is an urban legend. People Magazine Star Spotlight 2000, 'Willis agreed to a guest stint on 'Friends' simply because he and Perry thought it would be fun.' News outlets mistakenly reported on the rumor. Willis was in fact paid for the role, including syndication runs, but donated the money to The American Foundation for AIDS Research, AIDS Project Los Angeles, the Elizabeth Glaser Pediatric AIDS Foundation, the Rape Treatment Center, and UCLA Unicamp for underprivileged children.
When Rachel meets Elizabeth's father, she comments that he doesn't seem old enough to have a 20-year-old daughter. Bruce Willis was 45 at the time of this episode.
Bruce Willis and Matthew Perry appeared in The Whole Nine Yards (2000), not long before this episode aired.
One of Joey and Chandler's favorite movies is Die Hard. Bruce Willis is the star of Die Hard.
Sarah (Brooke Boisse) also appeared earlier in season 6 in 'The One With Ross's Denial' as Joey's Potential Roommate.