When Catherine drives up to the firehouse to tell Caleb she loves and forgives him, the bays are full and no trucks are in front of them, but when he comes out to see her the two bays are empty and the trucks are sitting out front.
When the firemen respond to a car wreck, the passenger in the front seat of the car on the tracks disappears and reappears between shots.
Caleb is dispatched to the house fire responding as Engine 1, but when he arrives at the fire, he is on Engine 7.
Michael takes a burger off the grill and puts it on a plate; then the camera cuts to another angle and the burger is no longer on the plate.
When Michael tells Caleb that Catherine is in the fire truck bay, he is wearing a shirt with pointed pocket flaps. Once Caleb arrives to the fire truck bay, he is wearing a shirt with straight pocket flaps.
When Caleb's father tells him that Caleb's mother was the one who did the Love Dare, the two men are on a long path in the middle of the woods, at least several hundred yards from Caleb's house. Caleb, an athletic fireman, immediately sprints back to his house to apologize to his mother, but his father, nearly twice his age, arrives at the house about 10 seconds behind him and not even out of breath.
In the train scene, they are unable to stop the train so they must lift the car off the tracks. The train passes at full speed (or what the viewer deems to be full speed.) At the very end of the sequence, in an aerial shot, the train is seen on the other side of the crossing. It could not have stopped that close to the emergency scene if it was going at 'full speed' when they were moving the car off the tracks.
During his talk with Caleb about the sanctity of marriage, Michael's nametag reads "W.C. Simmons." "Michael" begins with neither a "W" or a "C."
Caleb's speech is a fairly standard American accent, indicating that he is perhaps a Floridian, given the film's setting in south Georgia. However, his parents speak with a distinctively Southern accent, which seems rather confusing since they are supposed to be from the same family.