I've been on several (i.e. one is way too many) RJ flights in the past few months, but only noticed this on today's flight (7794 CMH-IAD) -- there are two video cameras mounted on the bulkhead walls (one @ 1A and the other @ 3D).

I was sitting in 3D and for once actually boarded early* so out of sheer boredom started looking around the plane.

*(As I was usually the last pax, I got annoyed at always being asked to move to the "back" to balance the weight - geez, just how fat do they think I am? Is my 145 lbs going to compensate for that much? -- I'm tall OK!).

Have they been on the Chatauqua (sp?) planes for a long time? If so, call me "Clueless".