Adrienne Barbeau, who played the loud-mouth wife of Hal Holbrook in the fourth episode "The Crate", was married to John Carpenter 1979-1984 and can be seen in his films "The Fog" (1980 -- Also with Holbrook, "Escape from New York" (1981) and in his tv-thriller "Someones watching me" (1979, aka "Highrise")
The second vignette, "The Lonesome Death of Jordy Verrill", was based on a Stephen King short story entitled, "Weeds". As you'll also probably know, this segment even starred King in the central role of Jordy.
Creepshow marks the last time that Leslie Nielson was able to play a big screen heavy. Of course, following Creepshow, he went on to become the physical embodiment of 80's slapstick in the Airplane sequel and Naked Gun movies.
The lighting effects were done by "Moonbaby" Schiff using theatrical dimmer boards in real time. He's also Marty Schiff the other Trashman with Tom Savini. The unions would not allow him to use his real name both as an actor and a technician.