Kurtwood Smith (Red), French Stewart (Daniel) and Courtney Peldon (Katie) all appeared in "3rd Rock From The Sun", s4e11 ('Dick Solomon Of The Indiana Solomons'). "That '70s Show" and "3rd Rock From The Sun" are both Carsey-Werner Productions, created by Bonnie and Terry Turner.
Howard Hesseman, who plays the contest judge, previously co-starred in "WKRP in Cincinnati" with Tim Reid, who had a recurring guest role in "That '70s Show" during season 7. French Stewart, who plays Kelso's competitor, starred in "The New WKRP in Cincinnati", its spin-off.
French Stewart (Daniel) co-starred in "3rd Rock from the Sun". Joseph Gordon-Levitt, who also co-starred in "3rd Rock From The Sun", made a guest appearance in the season 1 episode, "Eric's Buddy". "That '70s Show" and "3rd Rock From The Sun" are both Carsey-Werner Productions, created by Bonnie and Terry Turner.
Courtney Peldon (Katie) is the older sister of Ashley Peldon, who has played young Kitty in other episodes.
French Stewart (Daniel) co-starred in "3rd Rock from the Sun". Joseph Gordon-Levitt, who also co-starred in "3rd Rock From The Sun", made a guest appearance in the season 1 episode, "Eric's Buddy". "That '70s Show" and "3rd Rock From The Sun" are both Carsey-Werner Productions, created by Bonnie and Terry Turner.
Courtney Peldon (Katie) is the older sister of Ashley Peldon, who has played young Kitty in other episodes.
Mindy Spence appears as one of the guests at Hyde's party and French Stewart appears as Kelso's competitor in the radio station contest, but they shared no scenes. Months later, Stewart and Spence would share scenes in "3rd Rock From The Sun" (The Thing That Wouldn't Die, Part 1). "That '70s Show" and "3rd Rock From The Sun" are both Carsey-Werner productions, created by Bonnie and Terry Turner.
Lynsey Bartilson previously guest-starred in the season 2 premiere, as Tammy Sue.
Red & Kitty catch the kids drinking beer at the party. Red takes Fez's beer away. In later scenes, the kids are still drinking beer, meaning not only did Red not confiscate all the beer, he didn't kick any of the kids out, which he normally would've done.