It is Sam's recording. It's extremely lame of them to play Sam's performance (and yes, it's misleading) in this context and not credit him.I'm pretty sure that recording at the end is of Sam Pilafian. I think it's from a CD called "A Brassy Night at the Opera." I could be wrong though. It is a bit strange that they don't say who the tuba player is - they do lead the listener to believe it's Carol.
Dan