The episode "His Master's Voice" is loosely based on "The Shadow Over Innsmouth" by Lovecraft. In one scene where Kari walks past a sign, it spells Insumausu (Innsmouth) in Digicode. The "Scubamon" in the episode are based off the Deep Ones featured in the tale.
Actor-Shared Background: A mild/tangential example: according to the footnotes in the booklet for Digimon Adventure 02's DVD box, supposedly the reason for Ken and Miyako getting married in the finale is that their voice actresses (Romi Park and Rio Natsuki) got along very well with each other.
Fake Brit: While not actually British, being a Digimon and all, Hawkmon has a British accent in the English dub, while his voice actor, Neil Kaplan, is American.
Fan Nickname: The fake Divermon are referred by fans as the "Digital Deep Ones".
The inclusion of Davis into the story and the decision to not make him develop as a character.
The entire season owes its existence to this, as the head writer of Adventure didn't want to create a sequel.
On the other side of the Pacific, Jeff Nimoy stated that Digimon: The Movie was supposed to just feature the first two movies, but higher-ups demanded that he add the third movie in, which he wanted to be shown as a TV special.
In the series itself, Nimoy and his co-writer Bob Buchholz were instructed by Fox Kids to make the series "funnier" which annoyed a lot of fans. Eventually Jeff and Bob left the show due to frustrations with Fox's demands. Fox Kids must have backed off afterward because the final eight episodes of the season and the following season were noticeably less Gag Dub.
God Never Said That: A particularly widespread rumor in the fandom is that originally, the Distant Finale's couples would include TK/Kari and Izzy/Mimi along with the canon Sora/Matt and Ken/Yolei. The fans who talked about this kept citing an alleged interview with someone who worked on the show, but no evidence of that interview has been found.
Doug Erholtz replaced Wendee Lee as T.K. in the dub, but this is justified due to T.K. now being 4 years older. In the Japanese version, Taisuke Yamamoto replaced Hiroko Konishi after the latter retired from voice acting and subsequently became an Unperson to the series.
Doug also took over for SkullGreymon from Michael Lindsay, who voiced the infamous mon from his sole appearance in Season One as well as Greymon himself.
Because Jeff Nimoy left the show due to Executive Meddling, R. Martin Klein took over as Tentomon for the last few episodes. This also resulted in Steve Blum replacing the former's role as Gennai in the final episode.
In episode 43, Bridget Hoffman filled in for Tifanie Christun as Yolei. In the same episode, for one line only, Wendee Lee doubled for Sora, who is mainly voiced by Colleen O'Shaughnessey.
Anna Garduno, the voice of Palmon, was replaced towards the end of the series since Anna was commuting from New York by that time. Philece Sampler, the voice of Palmon's partner Mimi, voiced Palmon in episode 47; Dorothy Elias-Fahn, who voiced Palmon's ultimate form Lillymon, took over as Palmon for episode 50; the finale of the series.
For Revenge of Diaboromon, Jason Spisak replaced Joshua Seth as Tai Kamiya and Bridget Hoffman replaced Laura Summer as Patamon. These were the only major instances of the trope despite Adventure 02 having finished airing four years before and Saban Entertainment no longer being involved in the dubbing. It's an Actor Allusion in Hoffman's case because she voiced Patamon in Digimon Frontier.
There were a few cases of Digimon who had only one line in the movie (i.e., Gabumon, Hawkmon) where Jeff Nimoy impersonated the actor, simply because the budget wasn't big enough to bring Kirk Thornton or Neil Kaplan for a single line each.
Laura Summer voiced Noriko in her brief appearance at the end of episode 41, but Bridget Hoffman voiced her in all subsequent episodes.
Hiroshi was voiced by Brianne Siddall in episode 43 but is voiced in episode 50 by Dave Mallow.
Takashi had it the worst with Wendee Lee voicing him in episodes 40 and 45, Doug Erholtz in episode 44, and finally Brianne Siddall in episodes 46, 47, and 50.
Refitted for Sequel: By director Hiroyuki Kakudo's admission, the infamous epilogue was originally planned for the first series.
Screwed by the Network: During the Dutch broadcast of this anime, the Dutch Fox Kids had the rather strange policy of refusing to air episodes featuring snow or Christmas outside the respective season. Unfortunately, many important episodes, including the finale, take place during Christmas or snowy weather. This means the Dutch audience was unable to see how the series ended during its original run.
It's unknown who did the voice for Ken's older brother in the English dub, but in the original, both are voiced by Romi Park, who spends the entirety of episode 23 doing this (as the episode focuses on Ken and his past with his brother).
Not the only example of a Chosen Child and their sibling(s): having the same seiyū: Miyako/Yolei and her sisters (Momoe and Chizuru) are all voiced by Rio Natsuki.
In the original Japanese version, Megumi Urawa voices both Iori/Cody and his partner Armadimon. This is the first, and to date only, time that a Chosen Child and their Digimon partner have been voiced by the same person. In the English dub, Cody is voiced by Philece Sampler, who also voices Mimi.
In English, Derek Stephen Prince does the voices of both Ken and Veemon. The trope gets played as early as episode 2, when the Emperor taunts the captured Digimon.
Yolei's dub actress Tifanie Christun also voices Biyomon.
In the Swedish dub, both Ken and Matt are voiced by Leo Hallerstam. Which proves amusing in the World Tour Episode.
In both the original Japanese and the Latin American dub, Mummymon, Belial Vamdemon and Yukio Oikawa all share the same voice actors. You need to listen very carefully to hear any resemblance between the three characters' voices.
Production was a giant pile of Executive Meddling and Creative Differences, causing the situation that they were forced to propose, rewrite and abandon mountains of ideas on the fly while the series was being produced. You could clearly note it on how some episodes and events smell of Aborted Arc while some others have Arc Fatigue painted all over it.
The Dark Ocean was introduced by guest writer Chiaki Konaka and was originally supposed to be used as a larger plot point. The rest of the writers then proceeded to mostly ignore it.
The original plan was for Daemon was to be a Big Bad, but it couldn't happen.
In the English version, Jeff Nimoy did not want to combine the first three movies. Originally, he had drafted a script to combine the first two movies into a feature length film and release the first 02 movie straight to direct-to-video or as a tv special (with the older kids being kidnapped subplot and all the other major edits intact), but higher-ups at Fox forced him to combine them all to promote 02, resulting in a confusing mess and the 02 movie being hacked to bits.
Early character design sketches in 02 showed a lot more alternate outfits Mimi would have, including one with a Dreadlock Rasta. Thankfully, some of them didn't make it into the final draft, and the most unfortunate we got was the one with an afro.
Bandai had created 8 armor evolutions (for each crest) for each partner Digimon. There was a Digimental of Kindness that Wormmon could use to become Bucchiemon, though that did eventually appear in the audio drama The Unknown Armor Evolutions.
Ken was supposed to use the Crest of Kindness to evolve Stingmon naturally before it got dropped in favor of Jogress evolution.
At some point the digimon would've digivolved with both their main digimentals instead of just one. Hints of this can be seen in Sagitarrimon's design, which is clearly based on Flamedramon for the upper body and Raidramon for the lower body and head. This idea was Refitted for Sequel in Digimon Frontier.
Arukenimon was going to be Sasoribellamon, with a scorpion theme.
Ken's name was originally going to be Ryo, but this was changed due to the Tag Tamers games' protagonist having the same name. He and his brother Osamu's names are respectively written as 賢 and 治, in a nod to then-current Fuji TV producer Kenji Shimizu (賢治).
Taichi and the rest of the original members were originally planned to be the main cast. Also, the producers had discussed the idea of Yamato breaking from the group completely and joining the enemy side.
On the first version of Fox Kids' movie website, Willis' name was left as "Wallace." Updated versions replaced his name with "Willis", seemingly indicating that the movie was initially going to keep his original name.
In the English dub, Sora and Matt's sudden dating. The dub clearly favored Tai/Sora with constant teasing (including giving Tai an unrequited crush on Sora) while Matt/Sora got the short end of the stick with Matt acting like a jerkass. Comments from the original writer of Digimon Adventure indicate his general distaste for the pairing of male and female leads and he'd originally meant for Yamato and Sora to have a much stronger bond and foreshadowing of their eventual marriage. That said, there was still enough wiggle room for legitimate dissent of opinion. The Japanese voice cast for Sora, Mimi, and Gabumon (!) indicated in personal comments their surprise when it turned out Sora and Yamato would become a new couple, with Sora's actress indicating she figured Sora could be more open and straightforward around Taichi.
Matt being an astronaut in the epilogue is actually a leftover plot thread from an idea abandoned in production — a third year of Digimon Adventure was supposed to have enemies from space, but it was never picked up and we got Digimon Tamers instead.