Home Again - S2-E9
Plot hole: Old Ash travels back in time to 1982 to snatch the Necronomicon before Young Ash ever finds it (which should, presumably, erase all of the evil events from the original Evil Dead film right up to the present). Upon escaping the cabin, Old Ash finds that the timeline has self-corrected, and his amputated right hand has reappeared on his arm. But he is still in the 1980s. If the timeline had truly self-corrected, then Old Ash's car, his friends, and he himself would have vanished instantly from the 1980s, because the purpose of their mission never existed.
Plot hole: After Kara and Alex are run off the road, Kara is convinced by "Noel Neill", revealed later to be J'onn, to stop using her powers. From context, J'onn had to have been summoned by Eliza, but in 2007, she would still think he's just Hank Henshaw; she doesn't learn he's not, or even that he's a shapeshifter, until 2016, as seen in season 1's "Myriad", well after Kara and Alex have grown up.
Suggested correction: Time travel is not real. The rules of it are dependent on what the writers deem fit. Ergo, this isn't a plot-hole.
TedStixon
By that rationale, plot holes don't exist in any films, because the screenwriters are making all the rules. But, of course, plot holes do exist because screenwriters forget their own rules. In this case, the screenwriters chose to go down the path of correcting the Evil Dead timeline, but then they forgot to correct the timeline.
Charles Austin Miller
Baal was messing with time.