- Bad Export for You: Anchor Bay's US DVD release has no scene selections, dubtitles, replacing a credits song from the Japanese version with the English-version instrumental theme, and a confusing menu screen. Because of these complaints, 4K Media and Anchor Bay plan to give out DVDs with a more accurate translation for the Japanese version, correct any other mistakes on DVD and Blu-Ray, and honor requests for refunds or replacements with affected items. The song "To Believe in Something" however is still not in the new release, since it is a licensed song.
- Celebrity Voice Actor: The Kudaragi gang members are voiced by famous Japanese comedians.
- Colbert Bump: The song played in the end credits of the Japanese version, To Believe in Something, gained a ton of recognition from fans who saw the Japanese cut. And the song's not even Japanese.
- Contest Winner Cameo: 4K Media held a voiceover contest for fans to voice very minor characters in the dub, each with only one line.
- Cowboy BeBop at His Computer:
- Some promo descriptions on websites state 'Yami Yugi and Kaiba have a duel which bets their mutual experience...' The movie takes place after the Pharaoh has left, so this is a translation error.
- In the second Japanese trailer, they include an old DM footage featuring Atem walking towards the afterlife. This wouldn't be a problem if the movie was only a sequel to the anime, but it is first and foremost based off of the events of the manga. Thus, while Kaiba can clearly be seen as one of the observers of Yami's passing, in the manga he wasn't present at all for the event. The movie itself fixes this by redoing the footage without the Kaibas.
- Executive Meddling:
- According to the audio commentary the staff was told to add a scene where Kaiba and Atem duel, which was made into the Virtual Atem scene.
- The movie itself would've been made regardless of whether Takahashi was involved or not, and the producer asked for him to have a hand in it.
- Fan Nickname: Blue-Haired Mystery Villain for Aigami, the blue-haired villain, since virtually nothing is known about him. Yu-Gi-Oh! 5D's fans also opt for Blusei due to how much he resembles a blue-haired Yusei.
- Fandom Nod:
- The dub has Bakura's fangirls mention loving his accent specifically, which is common with his actual fangirls.
- It's been noticed that a number of the jokes in the dub wouldn't be out of place in Yu-Gi-Oh! The Abridged Series. It make sense, seeing as a lot of 4K Media's staff worked at 4Kids when they were still a thing, and they admitted to liking the Abridged series.
- Follow the Leader: After this movie was commissioned, several other franchise anniversary works began to crop up, such as a Cardcaptor Sakura sequel.
- The movie itself follows in the footsteps of Dragon Ball Z: Battle of Gods, being a new animated film helmed by the creator of the original manga and set in the manga's continuity.
- The Other Darrin: Wayne Grayson voices Solomon in the English dub, as his original voice actress, Maddie Blaustein, died from a stomach virus in 2008.
- The Original Darrin: Tara Sands returned to voice Mokuba Kaiba after she was replaced with Carrie Keranen for the final season of the TV series and in the short-lived uncut DVDs due to Sands moving away.
- Recycled Script: The film has a few similarities to Yu-Gi-Oh! The Movie: Pyramid of Light. A mysterious new villain (Anubis/Aigami) wielding a new Millennium Item appears (Pyramid of Light/Quantum Cube) and uses its powers to manipulate Yugi and Kaiba into a duel, which he then hijacks towards the end and is subsequently beaten by Yugi/Yami Yugi who uses Kaiba's card to aid in his victory. Both movies also feature Kaiba dueling a simulation of Atem to test out his deck, pursuing artifacts (Pyramid of Light card/Millennium Items) to help them in the final duel, and during the duel they summon powerful new variants of their trademark monsters.
- Role Reprise: The characters are portrayed by most of their original voice actors from the NAS anime, Yu-Gi-Oh! Duel Monstersnote . Most of the original cast from the 4Kids version return as well for the English dub.note
- The Italian dub only has the original voices for Yugi, Kaiba and Jonouchi.
- Shrug of God: When asked about the movie's theme, Takahashi said that while he has one in mind, it's up to the viewer to decide what it is.
- What Could Have Been:
- Originally there were plans for a movie in mind already, and it was going to be made with or without Takahashi's input, but the producer talked him into writing it. Takahashi himself then became the executive producer, story designer, character designer, and sole scriptwriter for the movie.
- According to the Millennium Book, a supplementary material released the summer of 2015 that has preliminary information on the movie and various trivia on the original series, this movie was originally going to be a spin-off movie starring Seto Kaiba. Alone. Apparently, Yugi and his friends weren't even going to show up. However, it was decided that Yugi, being the star of DM, needed to be in the movie, and so he was added to the script, only for it to become too long leading to it being completely rewritten to better accommodate Yugi without being overly long. note
- This art by Kazuki Takahashi is of a scene from the early script where Anzu was annoyed at Yugi and Jonouchi going nuts over cards when they could be paying attention to her.
- The Wiki Rule: The Yu-Gi-Oh! Wiki, and the forked site, Yugipedia.
Trivia / Yu-Gi-Oh! The Dark Side of Dimensions