Trivia / Wait Till Helen Comes

• Creator Cameo: For the television movie. Mary Downing Hahn mentioned to the director that she'd always dreamed of performing in a movie based on one of her own books. The director obliged by creating a small speaking part for her as the town librarian who helps Molly and Michael research Harper House.
• Real-Life Relative: In the television movie, Molly and Heather are portrayed by sisters Sophie and Isabelle Nelisse, respectively.