The Day Will Come When You Won't Be - S7-E1
Continuity mistake: When Negan makes Rick get the axe from the top of the RV, Rick is fighting the Walkers as he heads for the RV door after picking up the axe. He slams a walker's head into the back of the RV, blood splattering everywhere. Next scene shows Negan and Rick driving back to the group, and the back of the RV is spotless.
Continuity mistake: When they get back to the community after stealing all explosives from the road, the Saviors show up and search for Daryl. When they do, that's when they show a one-second clip of the guy Dwight killed a few episodes back, the guy who said there was nothing to go back to. The guy is then shown to be a walker in the defense yard of the Saviors. So, how is he shutting the van doors of a vehicle in this episode? (00:43:12)
Continuity mistake: When Morgan and Carol leave The Kingdom on horseback to take Carol to her "gone, not gone" house, Morgan is riding on Carol's right. When they are shown arriving, and Morgan dismounts, his horse is slightly in front of Carol's and to her left. Morgan throws down his staff and slings his reins over the picket fence. Then, he returns to help the still recovering Carol from her horse, and we see Morgan's horse is back standing neatly next to Carol's on her right. (00:42:13 - 00:42:52)
Continuity mistake: When Rick and Aaron are loading up the supplies from the houseboat, they put a container with a red can in straight and flush with the other container, so that the lid sticking up is to the left. In the interior shot of the van, the container is twisted sideways and pushed back with the lid to the front.
Answer: The walkers could have knocked them down more than once. There may have been another wave that knocked down the fence earlier and they're going to put it up again soon.
Captain Defenestrator