- Milestone Celebration: Ultra Seven X was made to commemorate the 40th anniversary of Ultraseven.
- Otaku O'Clock: Being aimed at adults, it was aired at 2.15am on CBC and 2.25am on TBS.
- Role Reprisal: Koji Moritsugu and Yuriko Hishimi cameo in the final episode as Dan Moroboshi and Anne Yuri.
- You Look Familiar: Nataru from episode 7 is played by Saaya Ishikawa, who was Deputy Chief Misaki in Ultraman Mebius. Additionally, Saku from episode 9 is Hassei Takano, aka Hiroya Fujimiya/Ultraman Agul.
Trivia / Ultraseven X