Reality Subtext: Peter Cushing plays Grimsdyke, a widower who attempts to contact his wife via Ouija board. Cushing's own wife had died shortly before he took the role, and he evidently insisted that he would be perfect for it. Ouch. The picture Mr. Grimsdyke is talking to? That's a picture of Cushing's late wife.
It also wasn't rare for more famous directors to be alluded to in the episodes they directed. When Robert Zemeckis made "You, Murderer" using the same footage-insertion technology as he did in Forrest Gump, the Crypt Keeper appeared as "Fearest", a slow-witted but kinder version of himself with a box of chocolates on his lap.
All-Star Cast: Sort of the entire point. Everyone from Christopher Reeve to Ben Stein showed up at some point.
Dawson Casting: Brad Dourif played the younger brother of Bill Paxton in the episode "People Who Live in Brass Hearses". Dourif is five years older than Paxton.
Edited for Syndication: You better believe it. FOX used to run repeats in their prime-time line-up during the mid-1990s (mostly on Saturday nights after the local news), and the series later turned up on basic cable channels, like the Sci-Fi Channel, AMC, and Chiller. The show on all the non-premium networks was edited for gore, sexual content, nudity, violence, explicit language, and, of course, making room for commercial breaks.
Market-Based Title: Known as "Hollywood Nightmare" in Japan most likely due to how obscure the American comics are overseas.
Larry Drake built a career on playing creepy, dangerous villains (and indeed, played themost creepy and dangerous villain in season 1's "...And All Through the House"), but in season 2's "The Secret" he plays the slightly creepy but very kindhearted butler who befriends the young main character and ultimately dies trying to protect him.
The dryly unflappable Ben Stein plays a short-tempered and verbally abusive mortuary owner in "Doctor of Horror".
Well-known horror actor Michael Berryman, recognized for playing mutants and monsters, plays Rupert Van Helsing (a Vampire Hunter) in "The Reluctant Vampire". The normally serious Berryman delivers a wonderful comic performance in that episode as well.
Sam Waterston appeared in the Season 5 episode "As Ye Sow," playing an unscrupulous private eye who offered to (and did) hire a hitman on behalf of his client. He would debut on Law & Order one year later in the role of Jack McCoy, a prosecutor with an unshakable drive to see justice done.
Besides Demon Knight, there were plans for two more movies. Dead Easy (a New Orleans zombie romp) which would possibly have opened the following Halloween that year, and Body Count (about a documentarian who discovers his uncle's dark secret).
Demon Knight was supposed to be the second film in the original proposed trilogy, but Universal Studios thought it should go first because it was "the most Tales-like" feature out of the three. Ironically, it ended up being the only one made.
Miguel Ferrer appears in prominent roles in "The Thing from the Grave" and "In the Groove", as well as having an uncredited minor role in "As Ye Sow."
Michael Ironside has roles in both "Come the Dawn" and "The Sacrifice."
Joey Pants appeared in both "Dig That Cat, He's Real Gone" and "Split Personality."
Larry Drake appeared in "...And All Through The House" and "The Secret."
Lance Henriksen appeared in both "Cutting Cards" and "Yellow."
Character actor Roy Brocksmith appeared in a few episodes: He has a prominent role as the mad surgeon in "The Switch" and had minor roles in both "The Man Who Was Death" and "Cutting Cards" (interestingly enough, playing bartenders in both).