Well the Seguin pick was close.
I know the 1980 NHL draft had picks 1, 3, and 4 moved in trades from previous years. Three hall of famers ended up going in the top 6.
Looking it up now - in 1976 the Colorado Rockies traded to Montreal the right for Montreal to swap first round picks in the 1980 draft, in exchange for Ron Andruff and Sean Shanahan (two players on Montreal's AHL team). Colorado ended up being awful in 79 so Montreal swapped picks. They then passed on Coffey, Larry Murphy, and Denis Savard and took Doug Wickenheiser 1-1.
hahahahaha