In the episode when Tommy's aunt comes to visit, the aunt gets to sleep in grandpa's room. When the aunt is preparing to go to bed, she takes off her wig and places it on top of the bowling trophy. And then she walks out of the room to go to the bathroom. When Tommy and Chuckie walk in shortly after that, when they're about to walk in, they show the room from Tommy's view. But if you look at the desk where the bowling trophy is, the wig isn't there.