The post-credits dedication to Windham glitches to reveal Bray Wyatt's lantern lightning back up while a mysterious voice is heard shouting "Run". But then a shadowy figure appears in front of the reactivated lantern that teases the return of Uncle Howdy.
There is an end credits interview with Mark Calaway where he talks about his involvement in the doc in addition to meeting Windham and Taylor when Mike use to wrestle him.