Have You Seen These People?

Occasionally my star-spotting eyes work faster than my star-spotting mind can place them. You see, I recognize them as celebs, but can't quite place where I've seen them - we've discussed this before. In the past, I've eventually been able to place them. After the MTV Movie Awards After Party, I've got a few new mysteries to solve. The first mystery is this fine gentleman. I think he said his name was Rob? Dan? Something like that. My sister thinks he's a comedian? I don't know. I just know he's from something super familiar.The next mystery is a comedian with a big gap in his teeth. I thought his name was Mike. He's on all those "100 Top Movies" specials or whatever they are on E (you know, like the Top Child Stars, or something like that). He's bald and gap toothed. Sadly, I can't figure out his name anywhere.The third mystery is also named Rob or Dan (my memory is obviously not serving me well). I remember him being on some of my teen shows (the original 90210 perhaps?) and having brown hair - not the grey hair he's sporting now. He was super nice (actually all of these guys were), I just can't place him to save my life. Help!

OK, I'll admit it - I'm not 100% sure that this guy is really a celebrity. However, I watched him for quite some time and couldn't shake the feeling that I'd seen him on something (as an assistant or secretary?). The problem is that when I asked him for a picture, he asked me why (ouch). I told him just because I wanted one (totally sly, right?). But, that doesn't necessarily mean he's not on something, as both Paul Schneider and Olivia Thirlby responded the same way and I knew what films they'd been on. So, asking doesn't immediately disqualify him from fame. Any ideas?