I'm actually been binging this from season 1 since last week. I've seen a couple of the later episodes, but I've never watched it from the beginning.
I didn't even know who Jan is... but yeah, her... returning assets were unmistakable.
@gmase , you make a compelling case sir.
I'm up to halfway of S5, so no Erin or Nellie yet. I'll withhold my vote until then.
The thing with Pam is that while she seems nice, she's actually a bitch, at least some of the time. When Jim is looking to have a truce with Dwight, she's the one egging him on to resume the feud. She's also been shown to be manipulative and selfish when it suits her, like when they were going to install a new phone system which would basically replace her, she made sure the Michael never got wind of the system.