Nearly 50 years later, CW's special crossover episode ScoobyNatural (2018) had series regulars Sam & Dean Winchester and the angel Castiel transported into this episode.
The plot is loosely based on House on Haunted Hill (1959), which was directed by William Castle and starred Vincent Price. Price later voiced Vincent Van Ghoul in The 13 Ghosts of Scooby-Doo (1985), whose title comes from Castle's 13 Ghosts (1960).
This episode was adapted into the comic book story "Night for a Fright" (Gold Key issue #8, October 1971).
It is very unlikely that Beauregard Sanders could actually have taken part in the Civil War, which ended in 1865, 105 years before the show aired (the last verified Confederate veteran died in 1951 at the age of 104). However, many Southerners then and now have been obsessed with the Civil War, and Beauregard might very well have had himself painted in a Confederate uniform without having actually been a Confederate officer.