Ive never been in FC on these planes, but according to seatguru.com:
2)The IFE Screens fold down from the ceiling in all classes. As for audio there are 12 channels.
3)Same Pitch, but the seat has 19.3" width vs 19.5" on the MD88. According to the seatmap the reason why there are 2 fewer seats is the addition of a closet in row 3.