Continuity mistake: In the scene in the garage near the beginning of the episode where the characters are gathering supplies, the sun is on them in one shot. In the reverse shot, they are dark and the sun is no longer shining into the garage. Then back to them, it is again.
Continuity mistake: The Wolf is shown to have filthy teeth but when Carol confronts Morgon in The Cell, his teeth are clean.
Knots Untie - S6-E11
Continuity mistake: When the bus gets stuck in the mud, the team leaves the vehicle. However, their shoes/boots are already covered in mud despite having not left the bus yet. (00:17:50)
Continuity mistake: When the sodas are retrieved from the cool box there are 6 cans, but when the angle changes there are only 4.
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 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.
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: During a fight with Gregory, Maggie's right cheek gets cut and blood runs down her neck, but the next day talking to Rick her right cheek shows no sign of ever being cut.
Continuity mistake: Maggie comes over to Rick's porch to chat about the group not being whole. When she arrives the sun is going down. She even says something about putting kids to bed. Near the end of the scene there is a closer shot of her and it is afternoon.
Continuity mistake: Daryl and Carol are walking to an abandoned home. Carol walks by a bush with bright sunlight coming from the left of the shot. The angle changes and it's overcast with no sun. Then we see Daryl again and it's once again sunny.
Continuity mistake: The hole in the wall Carol makes with the knife grows, depending on what angle we see it from.
Continuity mistake: Daryl is caught in a classroom and fights one of the Pope's men. He has him in a corner by the door where a walker comes. The walker gets killed by people on The Other Side of the door and it noticeably splatters on the glass. Two people break the door down and get inside. The splatter disappears on the glass.
Answer: Walkers are attracted to noise, they can tell who's dead and who isn't dead, in S1 when Rick and Glenn cover themselves in walkers' guts they're able to get far by walking through the herd of walkers because they smell like they're dead, but as soon as the guts get washed off by the rain the walkers immediately attack them, if you draw attention to yourself they will attack you which we've seen that many times throughout the series that it's not always successful. Whether you're covered in guts hiding under dead corpses or under a car.