Yes it was. It was a typical swiss-cheese situation, a diversion followed by a rushed departure with a member of ground crew rather than one of the pilots closing the door to help speed things up and therefore a pilot not seeing that the papers had been loaded too far aft.
As I recall it was the selection of land flap that caused the aircraft to pitch up. The crew recognized what had happened but were unable to recover the situation.
There but for the grace of god.......