Rolling Thunder
On some freighters there is indeed a small-ish compartment between the cockpit and cargo-deck with chairs installed for the carriage of "additonal crew members". Different from type to type, but generally to be found on the bigger ones. The A300's we operate have 3 airline type seats + a jumpseat by the door. Our 757SF, whilst having a small "lounge" behind the cockpit, does not have any seating there. Your MD11s will usually also have a couple of seats.
The upper-deck on most 747s will have a seating/rest area of some sorts. Have seen a -200F where the original bar was still installed, complete with ovens and fridges. It also sported 8 FC seats and in the very rear, hidden behind a curtain, 4 mattresses on the floor.
PS
The aircraft in "Castaway" was suffering from a bit of identity crises. On the ramp it was an A310, but enroute it was suddenly a MD11. Then again, when was the last time Hollywood got anything even remotely associated with aviation right?