The Day Will Come When You Won't Be - S7-E1
Other mistake: When Rick is on top of the RV, Negan peppers the roof with bullets from the inside, so that Rick has to run and jump onto the hanging walker. Negan's using a machine gun, so a lot of bullets, and the exit holes that are made, are visible on the roof. The softer material of the inside ceiling would have been really torn up, but when Rick gets back into the RV with Negan's axe, the ceiling is undamaged. (00:21:38 - 00:24:36)