Other mistake: When the Alexandria Group are at the Hilltop trying to convince Gregory to join them in their fight against the Saviors, we can see the actresses who play Michonne and Maggie trying to hold in their laughter. (00:06:02)

The Walking Dead (2010)
1 other mistake in Rock in the Road
Starring: Jon Bernthal, Sarah Wayne Callies, Steven Yeun, Andrew Lincoln
Genres: Horror
Other mistake: Earlier in the season Father Gabriel Stokes burns his clerical collar, but in the end of this episode he is wearing it again. Especially doesn't make sense, because he said he gave up being a pastor.
Rick Grimes: This is how we survive. We tell ourselves that we are the walking dead.

Indifference - S4-E4
Trivia: When Michonne and Daryl are walking toward the gas station sign, above the word diesel it spells out HELL in upside down numbers. (00:08:59)
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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