EPISODE 403: IN THE BEGINNING
When Azazel kills John and promises Mary he'll arrange for "lover boy to be brought back breathin'," the actor playing John is clearly breathing.
The Impala's first license plate with John Winchester is C-45P4.
Dean's date of birth is 24th January 1979.
Sam and Dean were named after their maternal grandparents, Samuel and Deanna Campbell.
There's no indication of how Dean knows how or where to find Mary and John at the end.
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