When Shawn Spencer answered the phone at one point, he said "Spencer for hire."
This can't be a reference to the TV show, as Spencer and Spenser share the same TV dimension.
But it could be a reference to the books by Robert Parker. His televersion must have written "true life" accounts about the Boston private eye. (So it is pozz'ble, just pozz'ble, that there was a TV series in Toobworld called about Spenser, but it wouldn't be the same show that we saw on our own screens in the Trueniverse.)
No Zonk here....