I recorded all the it crowd episodes and i was just watching them. Apparently on the third episode when moss is telling roy about previous night's Who want to be millionaire. Watch roy. Lol Everytime camera goes back on his face ... he is wearing different sunglasses.

This is 16 minutes into the third episodes. LOl i have notices quite a few things ...Like how signs on the doors are different on each episodes etc

Ah well

That's right. It's cos just before that he was asking Moss' opinion on which glasses made him look like a 'b@st@rd' for his date.