Revealing mistake: One of Umber's goat contact lenses is askew during this scene. (00:33:00 - 00:34:30)
Escape from the Happy Place - S4-E5
Revealing mistake: When the coach is killed by the monsters, the blood splatters onto the camera lens. The blood stays in one place until the camera slightly pans and it moves with the camera.
Revealing mistake: When the character named "Husband" is lying dead with his entrails hanging out, it is clear that the actor is breathing. Watch his stomach movements (near the intestines). (00:34:18)