Who to add!
More that could be added to "Who's On First?":
Mrs Whatsit, Mrs Who, and Mrs Which
Who-ville (after all, they'd need to play somewhere)
Someone named Ngo
Someone named Nguyen (so there could be a Ngo-Nguyen situation)
An issue of Y: The Last Man
The Y (after all, they'd need to train somewhere)
Anyone else? Anything else?
Edit: Thanks, Logan Jenkins! I could see Dr. No in this...