Hmm, echoing what everyone knows, more for Nanaki. After all he was quite talkative in the game. Though my crack theory is that Cait Sith wanted to steal all the lines so he put peanut butter on the roof of Nanaki's mouth while he was asleep and he didn't lick it all off until near the end of the movie.
Also from earlier, Tifa beating up Bahamut, she could have done a jump kick and knocked it somewhere.
And Reno and Rude as comic relief, my thoughts on this was that they happened to be in the wrong place at the wrong time.
One thing they could have changed, and I don't know for sure if this was stated earlier in this, was give Tseng and Elena more screen time. Someone's probably going to say that Tseng got all of the time made up from CC but seriously. I know that they got their asses kicked by the SHM but still... While I do appreciate the smidge longer they had, it didn't feel like enough.