Case 3, Turnabout Serenade. Am I the only one who even noticed the contradiction in the crime scene diagram? The bullet holes in the left wall prove he was shot from the right side of the room, yet his body was found behind the divider. Bullets can't go through walls, so how the heck did the top bullet get there? I'm pretty sure the body couldn't have been moved because of the blood found on the floor. Another thing, they were making such a big deal about how powerful the gun was, yet they just blow off the fact that Machi couldn't have fired the gun based off that. If the gun is as powerful as they say and Machi did fire it, he would have some kind of obvious injury from it.
Case 4, Turnabout Succession. Magnifi asked Zak to end his life (Valant too, but that's beside the point), so why the hell are they trying him? That's like prosecuting an assassin that killed someone on request. I understand this is Ace Attorney and wacky ♥♥♥♥ happens, but really? I do have to admit the part with the MASON System is pretty neato though, albeit a bit weird.