In one scene, an Eastern Bluebird (Sialia sialis) is seen nesting in a 'cup nest' in the forest. Whilst bluebirds do nest in cup nests, it is extremely rare. They are primarily cavity nesters.
When the new group first arrives at Alexandria Gabriel (Seth Gilliam) says "it'll be dark soon, first thing tomorrow we can bring them before the council for a vote" but you can clearly tell by the shadows being cast from the wall and trees that it is somewhere in the neighborhood of noon.
Alexandria's windmill vanes rotate despite having furled or missing sail cloth.