After the crash when Lincoln has become a fugitive, Kellerman is being questioned. He is asked his name and gives as an answer "Roy Huggins". Roy Huggins was the creator of the Fugitive in which a transported prisoner escapes after a crash.
When Michael and Tweener are in the yard Tweener mentioned he stole a Honus Wagner Baseball card. The 1909-11 T206 Honus Wagner card is the "holy grail" of sports cards. That particular card has sold for millions in the past. Very rare card