"A Saucer of Loneliness" is dedicated to the memory of Theodore Sturgeon, who wrote the 1953 short story of the same name on which it was based.
Lisa Jane Persky (Sandra) later played Marion Keisker in Memphis Melody - July 3, 1954 (1993), another time travel episode in which a time traveller takes the place of Elvis Presley as he records his first hit single "That's All Right" at Sun Records on July 5, 1954.
The Elvis Presley Estate gave permission to use Elvis' likeness.
The newspaper Gary reads from in the pickup truck is Memphis' own Commercial Appeal, still in print today.