They sing it a lower key now and they don't even try to do the ending part with the "Wee-hees" and "aaah-aaaahs." They just end it before that would have gotten to that part.
I think Randy might have been having a hard time not just with that but with the "Take it" part. When you watch live footage you can see him grimace and back away from the mike every time he has to sing the chorus's "Take it" part ~ which is a lot!