According to William Katt, the producers had planned a follow-up story to this episode, but to appease the network's directive that the series maintain its tame, "kid show" reputation, the idea was scrapped.
When Ralph and Bill find the stock certificates for an oil company in Kansas, Ralph says he thought all Kansas had was wheat. Oil in Kansas was discovered in 1915 and has been a significant part of its economy.
Christine Belford who plays Sheila the Spirit, lived as a child in The Amityville Horror (2005) house.
William Katt also starred in House (1985), a horror/comedy that contains several elements from this episode. The most significant being an old house with a portal to another dimension, guarded by an invincible monster.
The Redman House in the episode is actually the Historic Hirsch Mansion on Lucerne Street in Los Angeles. It also appears in the 1971 film, "Willard."