FB (sans silly tags):
So Zac's dad did go! :) The other dude was Burr's assistant on 17 Again and cstc. He's not listed for tlo (yet), but perhaps he is Zac's assistant this time around.
Oh, almost forgot... people.com mention (not from the restaurant above idt):
and if you want them even bigger (but hideously tagged) go here
And since Zef himself is as elusive as that
They are almost done filming there it sounds like...