I noticed this when rewatching it last week. I am so familiar with his performance on the album (i think OBC but maybe it's the OLC?)... and i couldn't help noticing countless discrepancies in how i remember his performance of songs and sections of them from my memory vs the film. I am not saying I want a carbon copy, I'm just taking note of much more emphasized the SPEAK part of his speak-singing was than on the recording. I'd think if he or the writers wanted to preserve it the way it was originally done, with him recreating his performance, they'd want to get that down. Obviously... it didn't matter to them, or he just wasn't able to sing it the same way, or didn't care to. But I'm curious if it's ever been spoken about... though I'm sure it probably hasn't.