* Dean has a love of the [[Magic Fingers]] bed relaxation system and memory foam mattresses
* In [[10.03 Soul Survivor]] Sam says "I got your blood type" which could easily mean he got a compatible donor. Dean could accept type O - which is the universal donor and can be given to people with type AB, A, B or O. As John is AB, and whether Mary is A, B, AB or O, Dean could be type A, B or AB.
* In 2016 Dean killed [[Adolf Hitler]].