- Author Existence Failure: This show was being conceived by Eiji Tsuburaya on his deathbed, and his son brought the idea to fruition.
- Contest Winner Cameo: Episode 34 "The Life that Can't be Forgiven" was the winner of a script-making contest held by Tsuburaya Productions. Its creator, Shinichiro Kobayashi, would later create a similar script for an identical contest held by Toho Studios in the 1980s, resulting in Godzilla vs. Biollante.
- Creator's Favorite: Jiro Dan, Hideki Go's actor nominated Twin Tail as his favorite monster.
- Dueling Works: With Kamen Rider with Return of Ultraman coming out a mere 18 days after it. Both were huge successes critically and financially.
- Follow the Leader: Helped launch the "Henshin Boom" along with Kamen Rider in the 70s
- Hey, It's That Sound!:
- Prop Recycling:
- Detton was made from the Telesdon suit from Ultraman, which had greatly deteriorated by that point. In fact, Detton's role was originally meant to be for Telesdon.
- Kingsaurus III's head was remade into Femigon's.
- Ghostron was loosely modified from Earthtron.
- Magnedon is a heavily-modified Eldertordoise suit, repainted black with back spikes added.
- King Maimai was created from Gudon.
- Zanika was remade from the Beacon suit.
- Alien Baltan, Jr. was remade from the Ultra Fight Baltan suit.
- Kingstron was remade into Robonez. Coincidentally, they are both killed in the exact same manner.
- Role Reprise: For the first of many times to come, Kohji Moritsugu and Susumu Kurobe respectively reprise Dan Moroboshi and Shin Hayata in Episode 38 "When the Ultra Star Shines".
- What Could Have Been:
- Originally, Eiji wanted the show to be a revival of the original, with the original Ultraman returning to Earth and Hayata reclaiming his identity as Ultraman, however Hajime scrapped these plans. It made more sense from a merchandising standpoint to create a new hero.
- Black King was intended to be the brother of Red King and would have used the same suit.
- Written by Cast Member: Shin Kishida, who played Ken Sakata, wrote Episode 35 (the one with Priz-Ma), which probably explains why Ken plays such a large role in the episode.
Trivia / Return of Ultraman