I have some interesting information that not a lot of people realize about the scene where they use Mikey on the roof of the old barn, but Raphael's voice is coming from him, shouting "Splinter!!". Raphael was ADR dubbed in to try and cover up an entire deleted scene. According to both the original shooting script used for the movie, as well as the original Mirage comics's version of the scene that the movie adapted FROM those comics (as well as many of the plot elements that are in the movie) and some on-set photographs that also back up confirmation that the scene was shot... Mikey was actually hit hardest from the loss of Splinter, as he is in denial about the loss of his father figure, and starts to withdraw from the others. In the original comics, as in the deleted scene as well, Mikey starts attacking a punching bag really hard (A few seconds of THAT remains in the film), and then gets continually angry and goes to start wrecking up parts of the barn as well. In his anger and frustration, forced to cope with his denial, Mikey then makes his way up to the top of the barn and screams. Apparently, what happened is that because this scene was cut, I guess they tried to turn Mikey into Raph in that scene, hoping no one would notice, and probably becuase they already painted Raph as "The angry one" and either thought giving Mikey the development of being frustrated and in denial or also being angry and full of angst would detract from Raph's arc, or they just wanted to keep the story simple since Mikey also never really gets any resolution from that development as well. Either way though, Mikey does go berzerk in the comics, the script for the movie featured it and set photos exist, so it would make the most sense that this was the movie's best attempt to conceal that, while still including it. And just for the record, other deleted scenes feature an extra introduction for Casey Jones where he quips about "crazy punkers", the Turtles emerging from the water by the warehouse in their introduction, a scene in the fight at the antique shop that had April contributing to the fight by knocking out a foot soldier by dropping something on his head, an exchange of dialogue between Donnie and a foot soldier about getting hit in the balls being "a recommendation to join the Vienna Boy's Choir", the entire "farm crop training" scene in which they turn their bandannas around to cover their eyes as blindfolds to play "Hot potato" with an apple, that originally had more dialogue and character development (Funny thing is, I saw this movie in theaters and the theater I saw DID INDEED have this scene in it, that, as far as I know has never been preserved in any other print made since), and of course, the famous "extended ending", where April presents a comic book version to a publisher and gets rejected for being "too unbelievable".