A couple I completely forgot :
I always thought Mullen finished his career up as a Penguin after leaving the Flames...which he did but he slipped away to Boston one year before returning to Pittsburgh
I had it in my head Nieuwendyk finished in Toronto but he actually had a strong year in Florida getting 56 pts in 65 games then retiring the next year after 15 games.
I should've remembered this one but most likely blocked it from my memory as I always liked Oates I didn't want him to have this taint on his great career.