This was probably noticable in the DVDs, but I noticed for the first time last night when they're doing a closeup on Picard in the Captain's chair, you can see the floor between the tactical station and the aft consoles and you can see a couple of thin (maybe an inch wide) black lines. I first thought they were some sort of cable or something, but after looking closer I believe its a track for the chairs that pull out from under the consoles. I've never noticed that before and had previously assumed they simply had wheels or legs and were taken out like you would any typical dining room chair.
*** Edit ***
Since this thread is more fun with pictures, here's what I was refering to:
Left of the Captain's Chair
To the right of Picard's head