Factual error: In the third scene, when Doug stops Jack for speeding, both vehicles in the scene have North Carolina state safety inspection stickers in the lower driver side windshields, as opposed to a Massachusetts inspection sticker (which would be on the passenger side).
Factual error: When Jack is carrying Jen out of Pacey's restaurant, she bends her head down. You can see that her now very long, curly hair is real and has a natural part. But this episode was in reality filmed right after the preceding episodes in Season 6, not 5 years later. And in the later episodes of Season 6 Jen had dramatically shorter hair. Although in the context of being 5 years later Jen's much longer hair makes factual sense, in reality it isn't possible that she could have grown her hair out that quickly between the Finale and the episodes filmed before it. So how did she? The shorter hair didn't appear to be a wig.