I've noticed that in some episodes the chairs in Ralph's apartment are a certain antique design and in other episodes the chairs are more modern. Then they go back to those antique chairs. Anyone notice that?!

The antique looking chairs:

http://i9.tinypic.com/4ou9uh3.jpg

The modern looking ones:

http://i9.tinypic.com/6biswfb.jpg

Through out the classic 39, you'll notice in the Kramdens apartment are two different sets of chairs. The antique looking chair above is from "The Babysitter" and the modern looking chair(below that)is from "Momma Loves Mambo" but in some episodes after Mama Loves Mambo, you'll see that their back to the antique looking chairs again and then the modern chairs come back in other episodes. Weird!!

That's interesting.
I think the cheaper looking ones are more along the lines of what Ralph Kramden would buy. Maybe he borrowed the other ones from Norton :p.