I was recently decided against keeping ALL of my 1986 Donruss set. Many are in my "to be traded" boxes but I couldn't rid the collection of this Pat Tabler card. Donruss immortalized Mr. Tabler with his nickname, Mr.Clutch.
Tabler didn't come by his impressive moniker by chance. He hit a more than respectable .488 (43 for 88) with the bases jammed. Some might call him the Jerry West of baseball. I am just not one of them (West was also known as Mr.Clutch). Tabler currently works as a color commentator for the Toronto Blue Jays.
I can't think of any other examples of random base card additions in the 80's but I am sure there are some. (Maybe Pete Rose had one?)