Lying Creator: NeoArtimus either lied or gave misleading information as an effort to keep stuff like the character's roles under wraps for those not involved in the project. For example, while making the voice casting for Part 2, which included Edgeworth and Trixie, she said the former was going to prosecute and the latter was going to be a witness.
Mid Development Genre Shift: This work evolved from a written fanfiction to an attempt at a gamenote In order to be able to put music in it, then to a radio playnote The game didn't work out, and then they settled for a game-walkthrough like videos note So visual elements could be added. However, an official game version of the series is in the works.
The victim Ace Swift is not the tennis player background pony nicknamed Ace.
Across the pony fanon there's Nix, Phoenix's new nickname courtesy of Rainbow Dash, and Nyx, Nightmare Moon's reincarnation from Past Sins. First Ultimate Marvel Vs. Capcom 3 and now this; Nick has a knack for sharing names with overly powerful beings.
One of Us: NeoArtimus was very surprised after learning that her work had an article on TV Tropes, and has claimed that she occasionally checks out the Wild Mass Guessing section, saying that she enjoys the fan speculation.
Schedule Slip: There were several important gaps in-between releases of the episodes. The most important ones were between both sides of Part 3, who were originally planned to be released at the same time, and between the fourth and final, due to the huge length of the conclusion.
Due to the original voice actress being busy dealing with other matters, Rainbow Dash was played by a different person in Part 2. This new actress stood as the voice for Rainbow Dash for the rest of the series' run, with the original actress changing roles to Spike. Likewise, Princess Celestia's voice actress also changed between her appearance in Part 3 - Twilight and Part 5.
Subverted with Apple Bloom's voice actress: there were enough negative comments on the videos because the voices "weren't as good as the original" that she wanted to quit at one point. However, many less hateful YouTube users (including Apple Bloom's VA herself) did their best to support her in the project, and she decided to join once again.
Trolling Creator: Ending Part 4/4 on a cliffhanger and stated it'll be continued in Part 5/4? Yeah, that's fits the bill alright. Although Word of God did confirm that the main reason to end it this way was practical; the conclusion would have been too long otherwise.
"The reason there is a part 5/4 is because it simply got way too long. Heck, part 5 still is probably going to be the longest part even being split like this. I really want to take my time on this part as I've seen lots of stories be ruined by a sloppy ending."
Ace Swift was originally going to be named Red Herring. It was later changed to fit the style of Friendship is Magic's namesnote It was adapted from Ace Baron, the name of a character in a previous Ace Attorney fanfic of the author.
Lenora's role was originally taken by the G1 pony Firefly, who would have been an overseas mailpony. Her role was changed in that of a friendly griffon to have a way to introduce the Griffon Express to the protagonists.
Part 3 wasn't going to be a two-parter at first, it was going to be only Phoenix investigating with Apple Bloom. After realizing that Twilight would basically do nothing through the whole chapter, the story was reworked to make her take an active role. With this change, the author also found a way to work Rarity, Pinkie, and Applejack into the story.
Part 3 - Phoenix was going to have a song, but it was cut due to time constraints.
Part 3 - Phoenix and Part 3 - Twilight were scheduled to be released one just after the other, as both of them had plot holes that the other explained, but due to some problems at getting the resources for the latter, there was a significant gap between them. Also, the original plan was to release Part 3 - Twilight first.
There was originally a scene where the reason behind Trixie's black psyche-locks would have been stated outright, but it was cut due to the already huge length of the final episode, and because the author considered it would add awkward exposition to something that was already implied strongly enough.