Looking at these photos again as I write this annotation, I recall that when I took them I had the entire office set built, and Will was actually sitting in his chair typing at his computer. Not that you can see him, since he's left of shot in all these photos. But isn't it good to know he's actually there?

I had a bit of trouble finding Mr Marlowe for this. I'd mistakenly put him away in the wrong compartment of my character storage box last time I used him. So instead of being with the rest of the Shakespeare office cast, he was actually hanging out with the MythBusters and the Romans.

I don't think that qualifies as a crossover.