Richard Harris is sadly no more. ;_;
Anyhoo. I found that Richard Griffiths was actually quite stiff at the beginning of the run. It took him a while to ease into the character. When he got there, he owned the stage! But before then, it was very hard to ignore that he was an actor playing a part in a play. As he's already done the entire London run, I shouldn't imagine this'd be too much of a problem for you guys; although they have had a bit of a break, so I don't know how much that could affect things.
Daniel Radcliffe is much better than you'd expect. Watch some Harry Potter before you go in, it'll lower your expectations quite a bit, and you'll end up pleasantly surprised. ^_^
I don't recommend stage-dooring this show. You'll get crushed. O_O But the London audiences were mostly very well-behaved with regard to the nudity. As long as the crowds shut up enough to get into the play, they should be feeling the moment sufficiently that when it comes, heckling and other massively inappropriate actions won't happen.
I am SO nervous on everyone's behalf that there's going to be wolf-whistling and stuff. You can act your way through audience laughter, but other things? I can't imagine! XP
