I learned Devilfish might not be the worst Italian Aquatic Creature movie ever done.
I learned that while Vic Morrow was a man of many talents, affecting an Irish/Brogue/Scottish accent isn't one of them.
I learned James Franciscus' minimal acting talents are less noticible when surrounded by the likes of Gregory Peck, Gene Hackman, and David Janssen. Or even Charleton Heston and James Gregory.