I was watching "Finders Key-pers" today, and in Arthur's imagine spot of the key they found being the Key to the City, the Mayor's name is Mayor Hirsch, which I assume is another nod to Peter.
I've also been wondering, some people have pointed out from "D.W.'s Deer Friend", when D.W. imagines how sad Walter would be separated from his family, he mentions a sister named Sheilarae, which some believe to be a nod to Sheilarae Carpentier Lau... can this be confirmed?
Yes both are true.
Wow, great job Snowth. Thanks for confirming Earwig.