Just like in The Parent Trap (1961) and its previous sequels, one actress, Hayley Mills, plays twin sisters Susan and Sharon. However, just like in Parent Trap III (1989), on-screen triplet sisters Megan, Lisa, and Jessie Wyatt are portrayed by real-life triplets Joy Creel, Leanna Creel, and Monica Lacy respectively.
The fourth installment and final sequel to The Parent Trap (1961), and the final time in which Hayley Mills would portray twins Susan Wyatt (née Evers) and Sharon Evers.
At the time of filming, Hayley Mills was also starring in the Disney Channel original series Good Morning, Miss Bliss (1987). After the Disney Channel canceled the show, NBC purchased the series, retooled it, and created Saved by the Bell (1989). One of Mills' on-screen stepdaughters, Leanna Creel, would go on to co-star in the final season of the latter show. Both Mills and Creel acted alongside Mark-Paul Gosselaar, Lark Voorhies, Dustin Diamond, and Dennis Haskins as Zack Morris, Lisa Turtle, Samuel "Screech" Powers, and Richard Belding respectively.