Mayor Matheson is named after the science fiction writer Richard Matheson, who wrote 16 episodes of La quatrième dimension (1959).
Ida Lupino is named after the actress and director Ida Lupino, who played Barbara Jean Trenton in The Sixteen Millimeter Shrine (1959) and directed The Masks (1964).
The key code to enter the cell block is "1015" which is the number frequently mentioned in the previous episode Nightmare at 30,000 Feet (2019).
One of the dolls seen on the table looks like the monster seen on the wing of the plane in the original 1959 episode of Twilight Zone called Nightmare at 20,000 Feet (1963) starring William Shatner.
The wrapping paper on one of the gifts is decorated with the face of "The Dummy" from the original The Twilight Zone (1959) episode The Dummy (1962). The doll itself also made a brief cameo in the pilot episode of this series, The Comedian (2019).