* BonusEpisode: A two-part episode focused on Shiori called "Lost Memories". While never featured in the show due to the series' premature end, it was released with the series on DVD as a full 45-minute special.
* PropRecycling:
** Kutuura, Frogos, and Rafleya were recycled from the ''Series/UltramanGaia'' kaiju Deents, Bokurag, and Lezite respectively.
** Banpira was modified from ''Series/UltramanCosmos''' Chaos Bug. Likewise, Lizarias was created from Neldorand, Arakunia from Yamawarawa, and Nosferu from Vadata.
** To create Izmael, the producers took parts from every other Space Beast suit and put them on the Galberos suit.
* TroubledProduction: Even accounting for the below network screwing, Nexus had it rough from the start. They couldn't get soundstages they needed, Tsuburaya's current CEO was dealing with sexual harassment allegations, and worse. [[https://ultrablogdx.wordpress.com/2020/05/08/ultraman-nexus-production-history/ See here for details.]]
* ScrewedByTheNetwork: ''Nexus'' was intended for older audiences (like the preceding ''Series/UltraQDarkFantasy''), but the show was bumped out of ''Ultraman''[='=]s Heisei era early evening prime time slot by ''Anime/MobileSuitGundamSEEDDestiny'' (based on the smashing success of ''Anime/MobileSuitGundamSEED'') and landed on 7:30am, as Saturday morning kids television. The change in tone and MisaimedMarketing led to the show getting cut down from 52 episodes to 37 due to low ratings[[note]]the show actually ''did'' meet the ratings goals that had been set for it in reruns at a better timeslot 3 months after it's initial run, so the show's bad ratings were purely because the timeslot it was at meant that it's intended demographic couldn't tune in[[/note]].
* WhatCouldHaveBeen: Before being ScrewedByTheNetwork, the producers had actually planned another 12 episodes centered on [[BloodKnight Nagi Saijyo]]. [[http://www.clubdesmonstres.com/best/htm/ultramannexus.htm Artbooks also reveal the designs for Dark Lucifer]], Dark Zagi's proposed SuperMode born from a fusion of all the Dark Ultras in the series. [[spoiler: Instead Nagi's arc is abandoned and she gets taken out by Mitsuhiko Ishibori in half an episode despite much plot buildup touting her as the fourth Deunamist. Zagi meanwhile is taken out the very episode he assumes his true form.]]
** A movie was intended for the series. However, Nexus' early cancellation led Tsuburaya to modify and recycle the script for the ''Film/UltramanMebiusAndTheUltraBrothers'' movie.
** The whole series (along with prequel movie ''Film/UltramanTheNext'') was intended to be a complete and total remake of Tsuburaya's Ultraman character! For better or for worse, the Franchise/UltraSeries would have stayed that way if ''Nexus'' wasn't ScrewedByTheNetwork. [[Series/UltramanMax The next series]] saw a return to the traditional aspects of the franchise, and due to how successful it was, the franchise has widely abandoned ''Nexus''.
** Nagi Saijyo's Junis form would have been Junis Orange.
** Concept art exists for Space Beasts likely meant to appear in the Nagi Deunamist arc as mentioned above, featured in art books on the ''Franchise/UltraSeries''. At least one of these was recycled for a monster in a later series. [[http://ultra.wikia.com/wiki/Unused_Space_Beasts_from_Ultraman_Nexus See here]].
** Originally, ''Nexus'' would have also included a Time Travel arc where Komon and Nagi will go back in time to reveal who saved Komon when he nearly drowned as a child during Nagi's times as a Deunamist. However, the arc was not being filmed due to the series being cut short.
** Dark Zagi was supposedly a dark form of Ultraman Nexus fueled by Nagi's rage and had to be saved by Komon according to a [[https://www.reddit.com/r/Ultraman/comments/ovcfld/was_reading_through_the_japanese_wikipedia_page/ Japanese wiki article]].
** Banpira's episode "Calling" was originally meant to be a two-part episode, but due to excess footage and the series being cut short, it was squashed into a single story. Fortunately, the full 45-minute DirectorsCut was eventually released on DVD.
** The final episode is a huge one: it's actually the script of three episodes merged into one.
** The climatic battle with Dark Lucifer would have seen Komon and Nagi both transform into Ultraman Noa as Co-Dunamists.
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