The episode "His Master's Voice" is loosely based off of "The Shadow Over Innsmouth" by Lovecraft. In one scene where Kari walks pass 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.
The two head writers for this series Genki Yoshimura and Atsushi Maekawa had two very different styles of writing, Maekawa's being story driven light-hearted stories, and Yoshimura's being character driven darker stories, both were told to write in their own preferred styles. This lead to them not seeing eye to eye on how the story should go, which resulted in a lot of fillers, to cover up for the time where they couldn't come to an agreement.
Meanwhile, the head writer for Adventure, Satoru Nishizono, left the Digimon project because he didn't want for a sequel to his series to be made.
Much of the main staff including Chiaki Konaka couldn't stand the executive meddling anymore, and so were ready to break their contracts and leave the project, but Bandai, unwilling to let them do this, gave them their own series, to mess around with instead.
Fan Nickname: The fake Divermon are referred by fans as the "Digital Deep Ones".
The decision to not make him develop as a character.
The loss of the Dark Ocean Arc, and Dagomon as an antagonist.
The entire season owes its existence to this, as the head writer of Adventure didn't want to create a sequel.
Also for the show having so many writers.
Jeff Nimoy stated that Digimon The Movie was supposed to just feature the first two movies, but higher ups demanded he add the third movie in, which he wanted to be shown as a TV special.
In the series itself, he and Bob were instructed by Fox Kids to make the series "funnier" which annoyed a lot of fans, eventually Jeff and Bob left, Fox Kids must of backed off because the final 8 episodes of the season were noticably less Gag Dub.
It may not even count any more, but Steve Blum is represented here as well, voicing all three of Veemon's Armor forms. He even does Flamedramon in almost the same voice he uses for Yamaki, which is...jarring, to say the least.
Yes, in original Japanese version, Wallace is voiced by Japanese voice actress, who has Surprisingly Good English while talking in English. Once you hear the near-perfect English, compare it to Momoko.
Romi Park (JP) and Derek Stephen Prince (EN) do voices for both Ken and his brother, resulting in them spending the entirety of episode 23 doing this (as the episode focuses on Ken and his past with his brother).
In the original Japanese version, Megumi Urawa voices both Iori/Cody and his partner Armadimon.
In English, Prince also does the voice of Veemon. The trope gets played as early as episode 2, when the Emperor taunts the captured Digimon.
Yolei's dub actress also voices Biyomon.
In the Swedish dub, both Ken and Matt are voiced by Leo Hallerstam. Which proves amusing in the World Tour Episode.
Jason Spisak replaced Joshua Seth as Tai Kamiya and Bridgette Hoffman replaced Laura Summers as Patamon in Revenge of Diaboromon. 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.
Technology Marches On: Averted - the show overestimated something like the D-Terminal showing up in 2002/2003.
Nodded to in the movie, Diaboromon Strikes Back. In Diablomon's first appearance, Our War Game, he manages to cripple Taichi and Koushirou by infiltrating the phone company and clogging everyone's modem. In DSB, Daisuke at one point nearly breaks into the Internet by borrowing some stranger on the street's laptop.
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.
Not to mention Daemon. The original plan was for him to be a Bigger Bad, but it never was able to happen.
Co-Head Writer of season 2 Jeff Nimoy did not want to combine all 3 movies and just wanted to combine the first two into a feature length film and release the third movie straight 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 them to combine all 3 movies, resulting in a confusing mess and the third movie being hacked to bits.
Early character design sketches in 02 showed a lot more alternate outfits Mimi would have. Thankfully, some of them didn't make it into the final draft, and the most unfortunate we got was the one with the Funny Afro.
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.
Really there is a lot of What Could Have Been this season, 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. For that matter if Ken had used the crest of Kindness to evolve Stingmon naturally before it got dropped in favor of Jogress evolution. The other three harmonious Digimon are unexplored (Digimon Tamers would but that's an Alternate Continuity)