Having played several seasons of the 2005 game I noticed that there are some great cards in that set for players that have huge injury risks. If you are willing to take a gamble they could burn you by being injured all the time or pay off big by staying healthy for most of the season.
In the 1969 cards that I have seen I haven't noticed any huge injuries to key players. The biggest injury I have noticed for a star is an injury on a roll of 3 for Clemente.
Am I missing the big injuries or if not why aren't they there. It must be that they had better Team Doctors back then :P