Time on type?
I haven't seen this mentioned in this thread yet, but I've heard some news reports -- can't vouch for their accuracy -- that although the pilot was fairly experienced, his time on type for the Dash-8 was rather short. Given the NASA video's emphasis on familiarity with aircraft type to discern potential tail plane icing symptoms, and others on this thread reporting rather skimpy training for tail plane stalls, could this limited time on type be a contributing factor here?