When Twilight chides Phoenix in annoyance for whining, he snaps, "I'm not whining, I'm complaining!" This is one of Rarity's lines in "A Dog and Pony Show". Guess who Phoenix bonds with the most?
Rainbow Dash gets quite upset after Nick assumes she is an Earth Pony; the reason may seem pretty obvious, but there's another less obvious motive for her to be upset. The previous Rainbow Dash was an Earth Pony, and polar opposite in personality to this Rainbow Dash, who likely would be irritated with her namesake's behavior.
While it may be a bad thing that Celestia wasn't gonna be a judge for Rainbow Dash's trial, it turns out to be a good thing in the end, as Celestia probably wouldn't allow Phoenix to accuse Fluttershy in order to buy more time.
Trixie is pretty damn successful holding up her case in the first day of the trial; she manages to end with the upper hand the first day of the trial, something Ace Attorney prosecutors can't brag about. She could be considered a Villain Sue by some but then again, she does have an advantage over the prosecutors in the games. Consider this: In the games, all the prosecutors not called Winston Payne come with a pretty open and shut case at first glance, same as Trixie; and usually have a piece of evidence or testimony they pull off from nowhere after Nick finds a contradiction, destroying Wright's line of logic, same as Trixie; and Phoenix manages to break their case just in time by using either "unimportant" evidence he collected or a testimony from someone he spoke to while investigatingnote Or the occasional Big Damn Heroes moment, making him get the upper hand at the end. But it's different this time. Phoenix took this case on very short notice so he didn't get the time to collect said case-breaking evidence and he's very aware of it. Not only that but he's on an alien world and has little knowledge on its workings. Of course Trixie is being so successful; she has an advantage previous prosecutors never had over Nick.
Phoenix gets increasingly pissed at Trixie calling him Mr. Wrong; kind of strange, as he trends to shrug off insulting nicknames (like Godot calling him Trite). He's got good motives to be pissed by that nickname though, since he's been called like that before, by Mia Fey's killer no less.
Why is Phoenix so rattled when Pinkie Pie starts calling him Feenie? Because that's what his girlfriend used to call him. You know; the one who tried to kill him and then frame him for murder? It's understandable that he'd want to limit the number of people… err… ponies calling him that.
When Phoenix asked if Rainbow Dash had ANYTHING to do with the death of Ace Swift (note the use of "had anything to do") he's remembering back to Case 2-4: Farewell, my Turnabout, where his poor phrasing of his question let Engarde slip through the Magatama's effect of truth detection. He DIDN'T kill the victim, but had a hand in his death.
That Cupcakes reference, or actually how Phoenix saw it, seems completely out of place, considering that Maya is also prone to those sort of creepy commentaries without Phoenix starting to see red backgrounds with eerie zoom-ins. But after some thinking, it's sort of justified why he got nervous with it. Note how Pinkie has been calling Phoenix "Feenie" the entire time she's been with him, which happens to be the nickname his murderous ex-girlfriend used to call him. He's been having constant reminiscences of Dahlia thanks to this, and Pinkie's creepy comment made him make an immediate connection with her, thus getting him nervous to a extreme.
Pinkie stops Phoenix from saying Derpy's name during their encounter. Despite many fans believing this to be a nod to "Derpygate", after watching Part 3 - Twilight it becomes apparent that Pinkie simply knew the problems that would arise, since it's normally Pinkie's hobby to memorize a basic bio of each and every single citizen of Ponyville.
It's weird seeing Trixie's Black Psyche-Locks being viewed as a Tear Jerker when the last person who had them was a Complete Monster. However, it makes perfect sense when you hear how Phoenix describes them when he faced the latter. One of the details he said to describe them was "full of despair". So in a sense, they're still the same, but in the former's case, that part of them is more remarkable than in the latter's.
Twilight admonishes Phoenix for cursing when Trixie revealed she knew the connection between Rainbow Dash and Ace, which makes sense when you realize that The Ace Attorney series is rated T, though the ESRB never mentions the mild language, while Friendship is Magic is marketed, usually, to little girls and thus uses unusual euphemisms for their swears.
This becomes doubly hilarious when Twilight again glares at him after one of the witnesses curses on the stand. Perhaps Phoenix's mere presence has upped the MLP universe's rating? note As if the murder hadn't already, of course...
Pinkie responding to one of Phoenix's inner monologues may seem like a silly off-hand gag, but she did have a good reason to know what he was thinking; after all, wasn't she the one that said later that she had read a good part of the script beforehand?
Phoenix teases Gilda during her cross examination since, as he said it, "Anger makes you stupid". This fits particularly well with the motives that lead her to tamper with the crime scene.
Rainbow Dash's anger at Fluttershy for testifying puzzled me. Then I remembered: "Oh, right. Element of Loyalty". Of course she'd take a perceived betrayal more personally.
How come Trixie has formal education as a lawyer? Seems kind of off until you consider something Sonata mentions: That Unicorns from Canterlot generally take multiple jobs. Trixie's from Canterlot, so this would apply to her as well.
Then again, why study law? Isn't it an incredibly hard and time-consuming carrer? Remember something Twilight says in Part 3 - Twilight: Most crimes that take place in Equestria hardly warrant trials and lawyers. Unlike on Earth, being a lawyer in Equestria wouldn't exactly be a solid job choice to take. Chances are being an attorney is considered a secondary job for the ponyfolk at best, something easy they can study just because they can.
After Phoenix was knocked out, had his evidence stolen, and then left for dead, he was faced with some timberwolves. Which leads to the revelation: Was whoever knocked him out planning on having the wolves kill him?
They might not have planned on him dying; just getting him lost in the forest so he wouldn't be able to get back out easily.
Twilight says that humans have such a commendable sense of justice that ponies based their justice system on the human's. Considering how much of a mess is the court system in Ace Attorney, and assuming that humans are not the only alien species that have wound up in Equestria, just how much must criminal justice suck for other alien species in this MLP and AA universe? And how harsh must have been justice in Equestria before contact with humans?
Banishment to celestial objects seems to be a popular form of punishment.
Speaking of… Would this mean that Luna killed someone before she was banished to the moon?
If we follow the argument that eternal night would lead to the death of all living creatures in Equestria, even if Nightmare Moon is not guilty of directly murdering anyone, she would be guilty of attempted genocide at the very least. It's also possible that some ponies already died as a consequence of her actions before Celestia could decisively defeat her.
I think it's more of like the Equestrian haven't needed a legal system to deal with crimes like murder and the court system in the Ace Attorney world, for all the wackiness one can see at times, works for the humans.
More a case of Fridge Sadness, but as funny as it is to watch Twilight flounder around during her conversation with Derpy, the idea that Derpy has a mental disorder that makes her believe that nopony bothers to remember her name is rather depressing.
Just the fact that Apple Bloom was almost surely at the scene of the murder and possibly as it was happening. If she hadn't been blinded by the flash and scare... I mean startled by the lightning, who knows what the murderer might have done to her?
That is banking on the fact that the murderer is as heartless as Ace was which, as of the end of Part 4, is looking to be only mostly true, but considering how most of the suspects have legit reasons of why they should kill Ace, but wouldn't do the same to another person… er, pony, that would seem unlikely.
Point but bad things don't necessarily have to be deadly. What if the murderer isn't one of the nice victims who we've seen and is willing to hurt ANY being that gets in their way. Apple Bloom might not have died if this is the case but can you imagine the guilt Rainbow would feel if she was indirectly the cause of one of her best friends' little sister ending up in the hospital or kidnapped?
Considering that Apple Bloom magically ended up outside of the Forest, and considering the person she bumped into in the darkness of the forest was the only person there, and quite possibly the Murderer, and the person implicated at the end Part 4, she may be as bad as we think.
What if Fluttershy had been a little late with saving Phoenix's butt in both occasions?
Interestingly, the bad ending contest has imagining this situation as its premise.
The story was written before season 2, and also takes place before it. Keep in mind that this trial is for the holder of one of six Elements of Harmony. If she gets banished to the sun, there might be no way to get her back to use the Elements of Harmony to take out a certain threat. Care to guess what happens when season 2 begins?