The heated rear window problem could be the switch that is Knacked. If the light doesn't come on and the element doesn't heat up I rekon that may be your problem.
On the subject of the interior light, have you checked the doors are making contact with the switches (just below the door latch, covered with a rubber small boot)? If they aren't your lights won't go out as your electrical system will think the door is still open!
Hope this helps
