When Rick and Darryl arrive at the gas station after finding the semi truck full of sorghum, Darryl leaves the passenger door of the truck ajar. However, in the next shot, the door is now closed.
Nicholas' names was rubbed off the memory wall by Aaron, its back up again like it never happened.
When Daryl is fighting Jesus inside of the truck on the farm, truck gets knocked into neutral. This is impossible because they show there are no keys in the ignition. Additionally, all vehicles have a safety mechanism in place where the transmission cannot be engaged unless the brake is depressed.
Deanna was last seen on the second floor of the house about to be swarmed by walkers.
Here, Deanna is discovered wandering outside the walls of Alexandria as a walker (and never fed upon).