Because the finale was filmed before the spin-off Bunk'd was officially confirmed, the episode doesn't explicitly lead into the events of the new show.
The finale follows Jessie Prescott as she finally achieves her dream of becoming a professional actress. [S4E20] Jessie Goes to Hollywood
Feeling like their mother still doesn't have time for them, the children secretly follow Jessie to Hollywood. While trying to watch her film, Luke and Ravi cause the giant "H" on the Hollywood sign to tip over. Because the finale was filmed before the spin-off