Wait... when you say you loved that "they were in the audience", do you mean that you loved the audience shots... or is there actually a part where members of U2 are shown in the audience (whether for real, or added in)? If it's the latter, I had no idea - do you remember which part?
Yes, amazing job with the lip-synching, and picking various shots; ditto with the instrumental parts.
And I agree with lilithlotr, I wish they would have mentioned that Beecake have a great sound! They aren't just a band with an actor, nor is Billy just an actor with a band - they are a band, a really good band. I did like finding out that BJ and John have been friends with Billy since their teens and that they were in his bands from his pre-acting days.