This is the second time Shadia Simmons and Kerry Duff play sisters, the first being in the 1996 Goosebumps episode 'Night of the Living Dummy II'.
The final episode of "Are You Afraid Of The Dark"
Kerry Duff, who portrayed Nicki is the younger sister of Shannon Duff, who played Laurie Napier in the Season 4 episode 6, "The Tale of the Quiet Librarian."
Amanda Strawn who portrayed as Emily's Mother, previously appeared in the episode "The Tale of the Shiny Red Bicycle" as The Nurse. Then she appeared again in the Season 5 episode "The Tale of the Chameleons" as Mrs. Robinson.
For some unknown reason this episode isn't on paramount streaming.