When Beth was shot by Dawn at Grady Memorial the bullet entered Beth's lower chin and exited through the top of her skull, yet here she is shown with a gunshot wound to the forehead.
When Tyreese gets his arm cut off no one is seen putting pressure on the wound, not when he's being carried, and not even once they get him in the car. Just having a tourniquet on wouldn't necessarily be enough to stop the arterial bleeding, though putting pressure on it would help the blood to clot. A properly placed tourniquet may stop an arterial bleed, however.
Chad Coleman's pulse can be seen in the movement of his leather neck charm when he is in the grave before the sheet is placed over him for burial.
Despite months earlier realizing that walkers seem to migrate, and the walker herd that scared Sophia heading north east, Rick and the others decide to continue in that direction toward D.C.
Despite Noah trying to kill a couple of Rick's group, and some of the residents of the hospital appearing mentally ill, they have immediate and complete trust in him.
The group has left the Atlanta region without ever checking in on the group from 'Vatos'. It's as if they either completely forgot about that good group of people there, or they wanted to endanger them, knowing those at Grady would eventually find them.