Professor Stokes is a wonderful character. Everybody else is enchanted by Barnabas's old world charm and courtly manners, but Stokes complains about Barnabas's hospitality. No doubt if Stokes had attended the costume party, he would have asked when Barnabas was going to bring the cheese out.
I get the impression that Stokes has no personal experience of the supernatural at this point. If he had, he would surely be talking about it. “I would like to meet your witch, and see if she is in any way connected to a most fascinating witch whom I met on a recent journey to the year 1427. Sadly, that witch was burned at the stake before she could whip up the Love Potion #6 that she had promised to make for me.”
I noted that Barnabas and Lang are now on a first-name basis. It seems unduly intimate. I get surprised when Barnabas calls Burke and Joe "Devlin" and "Haskell", but to hear Barnabas call Dr. Lang "Eric" - oh, gosh, I wish Barnabas would be more careful in choosing his friends.