The water park the gang goes to is actually called Raging Waters and is located in San Dimas, CA.
The woman at the end who yells, "Has anyone seen my son" is dressed similarly to Mrs. Kintner from Jaws (1975) whose son was eaten during the beach scene.
David Benioff and D.B. Weiss, creators of Game of Thrones (2011) and writers of Flowers for Charlie (2013), have cameos as lifeguards. The director of this episode, Matt Shakman, is directing an episode in "Game of Thrones"' seventh season.
Frank's remark "They should have sent a poet" when standing on top of the Thunder Gun slide is a reference to Contact (1997)