For the first three Ace Attorney games, if the game detects the GBA version of the Japanese release of Ace Attorney, Gyakuten Saiban, in the GBA slot while starting the Japanese DS version, the first four cases are unlocked from the beginning. The GBA-slot support was removed from international releases.
Mia Fey's Japanese given name, "Chihiro", can mean "great depth", or "a thousand fathoms". Shu Takumi describes her name as being a pun, with the kanji together meaning "a thousand questions", as in "If I have to ask him 1000 times, I will!" The second kanji is also the first in "cross examination". The "sato" in her Japanese surname may come from the word for "village" or "home country", while the "aya" part has no particular meaning.
Apollo Justice's Japanese surname, "Odoroki", comes from the word for "a surprise".
In Edgeworth's original design, he was going to be a 36 year-old veteran prosecutor, but the staff decided that was not interesting enough as a rival. When Shu Takumi saw the second version of the character, he was struck with inspiration and created the back story between him and Wright.
Miles Edgeworth's name may come from "edge of a sword", just like his Japanese surname "Mitsurugi", which contains the kanji for sword. This may be a reference to both Gregory and Miles Edgeworth having sharp minds and being "worthy" opponents for Manfred von Karma and Phoenix Wright, respectively. His first name in Japanese, "Reiji" comes from the kanji for "cleverness".
Maya Fey's Japanese given name, "Mayoi", means "true evening". When written in kana, "mayoi" means "hesitation" or "doubt". The name was apparently picked from a list of kanji that Shu Takumi liked. "Maya" was chosen as her english name because it closely resembles her Japanese name. The name Maya can either come from the Sanskrit for "illusion" or, similarly to her sister Mia's name, as a pet form of "Maria", which is itself the Latin equivalent of "Mary". "Mary" is originally from the Hebrew for "bitterness". This could be a reference to her sister's unpleasant death. Other possible meanings include: "rebelliousness" and "beloved-child".
During production, the name "Souka Naruhodou" (which translates to "Oh, yes, I see now") was suggested as Phoenix Wright's Japanese name, but quickly dismissed. It was decided to settle for just "Naruhodou".
In the Japanese versions of each game, Maya Fey's favorite food is ramen. However, this was changed to burgers in the US releases.
##Sega## built a theme park attraction called the "Gyakuten Kenji in Joypolis" dedicated to the Gyakuten Kenji games. The attraction has each visitor investigate a crime scene and look for clues in 20 minutes, after which they then write their conclusions in their own organizers.
Phoenix Wright's Japanese surname, "Naruhodou" is a reference toward the Japanese expression "naruhodo", which roughly means "I see", "I understand" or "indeed".
In the French translations of the games, Detective Dick Gumshoe is named "Dick Tektiv", a pun on the word "detective".
Shu Takumi, the creator of the Ace Attorney series, had always wanted to make a mystery game. He gained this opportunity when Capcom told him to get 7 inexperienced employees and "make whatever you want". His idea for a lawyer based game was frowned upon by the higher-ups, but tried to convince them that the game would be interesting with it's "eccentric" characters.
The first 3 games in this series were released on the GBA, only in Japan. When the first game was ported to the Nintendo DS, a new case was added. This case caused a continuity error in the second game, when the original last case of the first game was said to be Edgeworth's last case.