You can clearly see Wilson's face...
When the Taylors were at Wilson's house for dinner (Dinner With Wilson). They were talking about Wilson selling his house, and there are two distinct shots where you can clearly see all of Wilson's face- once where he is in the kitchen, the other where he is behind the Taylors as they were sitting down at the table.
I am surfing the Aunt Bee chatroom... I have officially hit rock bottom.