Episode #819: Invasion of the Neptune Men - Space Chief, aka the muffiny-haired, chicken headed bachelor who saves Japan from the Bullethead family reunion, is actually Sonny Chiba.
Episode #1112: Carnival Magic - Director Al Adamson ended up being murdered by his live-in contractor, who then stuffed his body under an indoor jacuzzi.
Episode #706: Laserblast & Episode #704: The Incredible Melting Man - Cheryl Smith played the roles of Kathy and The Model, respectively, in these two cheeseball sci-fi flicks. Cheryl, also known as Rainbeaux, was also a member of The Runaways and started her acting career as Lila Lee in the cult vampire film Lemora: A Child's Tale of the Supernatural.
Episode #704: The Incredible Melting Man - Late in the movie, an expendable young couple stumble into the film for no other reason than to provide fodder for the Melting Man of the title to kill/terrorize. The guy - who ends up getting murdered to death - is Jonathan Demme, who would go on to win an Academy Award for The Silence of the Lambs, one of the many films he directed before passing away in 2017. The woman - who gets terrorized in her dingy kitchen for a while - was played by Janus Blythe, who starred in the original The Hills Have Eyes as reluctant cannibal girl Ruby, and made out with a pre-Freddy Krueger Robert Englund in Eaten Alive.
Episode #811: Parts, The Clonus Horror - Early in the film during big dumb George's going away party before he is sent to "America" he slips away for a few moments with his lobotomized girlfriend to say goodbye. The girlfriend is played by Eileen Dietz, who had a tiny role in a little film called The Exorcist. Specifically, Eileen played the role of Pazuzu; it is her face we see painted in the quick flashes and nightmare sequences, and it is her we see backhanding the doctor and puking on Father Karras.