When Kenny runs into the living room holding a plunger, Mrs. McCormick's shirt alternately changes from "I'm With Stupid" to "God Bless America."
The name of the board game the boys play switches back and forth between "Bill Curtis" and "Bill Kurtis."
Throughout 'Cartman Joins NAMBLA (#4.5)', Kenny's mom shirt changes style, changing between a 'I'm With Stupid' shirt to a 'God Bless America' shirt.
While the McCormicks are on the "John Denver Experience," there is nothing written on either Stuart's cap or Mrs. McCormick's shirt.