- Casting Gag: Hayata works as the owner of a bike shop in the movie, but this isn't the first time Susumu Kurobe has appeared in the Ultra Series as a bike shop owner. Similarly, Dan Moroboshi being a restaurant owner reflects Koji Moritsugu's real-life present-day job as a restauranteur.
- Development Gag: Hayata and Fuji are an Official Couple in the universe where this movie takes place, with an alternate version of Rena Yanase as their daughter. This calls to mind the original plan for Ultraseven where Hayata and Fuji would also have married and had a child (though said child was a boy).
- "No Talking or Phones" Warning: A hilarious one featuring Hipporit and the eight eponymous Ultra Brothers is featured in the teaser trailer. Seen here.
- Real-Life Relative:
- Rena is portrayed as Hayata's daughter here, reflecting the fact that Takami Yoshimoto is the daughter of Susumu Kurobe.
- Similarly, Goh and Aki's daughter, as well Hokuto and Minami's, are in fact the real-life daughters of Rumi Sakakibara and Mitsuko Hoshi respectively.
- Fujimiya's family seen at the end of the movie are the actual wife and child of Hassei Takano.
- Role Reprise: Tons. Susumu Kurobe, Koji Moritsugu, Jiro Dan, Keiji Takamine, Hiroshi Nagano, Takeshi Tsuruno, Takeshi Yoshioka, Hassei Takano, and Shunji Igarashi all reprise their respective Ultras' human identities. We also have Hiroko Sakurai as Fuji, Yuriko Hishimi as Anne, Rumi Sakakibara as Aki, Mitsuko Hoshi as Minami, Takami Yoshimoto as Rena, Risa Saito as Ryo, Ai Hashimoto as Atsuko and Yukari Ishida as Reiko.
- This film was Hiroshi Nagano's last outing as Daigo. To some extent, this can be seen as a grand send-off to the character.
- This film also features an alternate version of Jun Manjome, the very first Ultra Series protagonist, played once again by Kenji Sahara.
- What Could Have Been:
- The working title of the movie was Ultraman Mebius and the Ultra Brothers 2.
- Ultraman Taro was later meant to be the star at first, making the film a sequel of Ultraman Story. Ultimately this was dropped and Taro only makes a cameo through archive footage of Ultraman Mebius and the Ultra Brothers..
- Originally, the monsters intended for the film were Vakishim, Twin Tail, Astromons, Tyrant, Monsarger, Eleking, Red King, and Gomora. The result would have been a much more complex Giga Chimera (which would have been called Grand Tyrant instead), but the monsters were changed and reduced in number in order to simplify things.
- After being changed from Grand Tyrant to the final design, Giga Khimaira was going to be called Ultisaur, but Tsuburaya chose to rename it after receiving suggestions to do so from the public. This in turn caused the monster to go unnamed in the film itself due to conflicting issues over its name before it was settled on Giga Khimaira post-production.
- Yapool was originally envisioned as the film's Big Bad. However, since Yapool was already featured in the previous Ultraman movie, Ultraman Mebius and the Ultra Brothers, another (very similar) villain was made in the form of the Black Silhouettes with Super Alien Hiporit serving as the figurehead antagonist. Had Yapool been used, Super Alien Hipporit would've been his Dragon with Tyrant serving as his main monster and the base for Grand Tyrant.
- One of the returning kaijus to be resurrected by Alien Hipporit would've been Black King, but he was ultimately replaced by Pandon, probably because the naming conventions given to the monsters being christened as "King" would've made Black King "King Black King".
Trivia / Superior Ultraman 8 Brothers