What's with this non-exit Exit sign on Delta CRJs?
Normally there is some kind of barrier, a bulkhead or curtain, separating the business class and the common folk in steerage.  In such a case the sign is to indicate that there is an exit somewhere down yonder beyond the bulkhead.

In this case the curtain is not there so the sign kind of hangs there with its nonsensical implication that maybe there is an exit right next to it.  I'll go out on a limb and guess that the regs require the sign to be there between the two classes regardless of whether a visual divider is in place.