^I'm not entirely sure cause it's been a while, but I remember he talked about how it was hard to decipher the lyrics at times and that he wrote them down and eventually checked them with Michael - I think he gave the example of how he read the lyrics of Monkey Business back to him and when he came to the 'I caught your mother she's doin' the do'-part, he kinda said it with a question mark and Michael laughed and was like 'yes Brad, that's what I said' lol.
But with the way he told the story I can imagine some words might have slipped through that weren't the correct ones, and I can also imagine they didn't 'confirm' every ad lib with him.. For me it sounds like 'doggone it' but just differently pronounced.