From the "Training" chapter of the "CAA Helicopter Tail Rotor Failures" I found this paragraph which reminds me of the best schools I have visited.
"In the civil world there is very little opportunity for the transfer of experience across the generations of aircrew, in contrast to the military environment which involves crew room discussions, pilot's notes quizzes and general scope for the exchange of anecdotes. Civil pilots tend to come to work, fly and go home. The military also foster interest in the technical aspects of aircraft emergencies through articles in flight safety magazines such as Cockpit and Air Clues. There is not the same incentive in the civil environment to produce such an article (commercial confidentiality, liability and other questions arise) and not the same forum in which to discuss ideas."
I have sat around in a "crew" room at a very good flight school where just this sort of discussion took place. It was fostered by having a very open door where every man and his dog from the rest of the airfield would wander in for free coffee and shoot the sh!t. Students learned more from there than the briefing rooms.
So spend a little on the social areas and encourage pilots to hang around. Free beer on Friday nights works too.