The film is based on the 1984 short story "Gramma", found in Stephen King's collection of short stories titled "Skeleton Crew". It was previously adapted as the first segment of Gramma/Personal Demons/Cold Reading (1986).
R L Flag Home for the Aged is most likely a homage to the character Randall Flagg from Stephen King's "The Stand".
The type of adult diapers are Bachman brand. Richard Bachman was Stephen King's nom de plume (pen name).
Jack Carter's final acting role.