-Unique, distinct arenas (Montreal Forum, Boston Gardens, Maple Leaf Gardens, etc.)
-CCM Jerseys
-Low scoring playoff games where practically no penalties were called. Let the players play and see who wants it the most. Some of the most epic games of all time end up with a 1-0 score.
-Acrobatic goalies (i.e. Richter, Hasek, Fuhr, Joseph, etc.). Nowadays, goalies are big enough and have enough equpiment that they don't need to make many saves, the puck just comes to them.
-Players staying with the same team for long periods of time. There is too much player movement in today's game. Though, we might see this crop of young guys stick with their teams for a while (Crosby, Ovechkin, Toews, Stamkos, Kopitar, etc.)