I had two main gripes with the final episode:
1. The implausibility of Vernon taking the boat. It just doesn't make sense. Vernon's group was secure, stocked with food and medicine and no longer under the threat of Crawford. He understood Lee's plight, having lost his own daughter. WHY would Vernon dismiss all of this to risk Lee and Clem's lives, while at the same time leaving his safe haven for the risks presented by the boat? Far-fetched.
2. Even if you do not agree with taking the food from the car at the end of episode two, the stranger STILL centres you out for revenge. Why would he do that? Why not Kenny, who was so eager to take the food from the car? Great that they tied this choice in with the bigger picture, but awful that it was an unavoidable tragedy.