The Monsters are Due on Maple Street - S1-E22
Plot hole: The street sign in the beginning is all wrong: it faces the camera rather than the street where the story takes place. In a typical American city, street signs are almost always placed in the direction of the street they are indicating, so drivers on the other street in the intersection know what they are turning onto or passing. In other words, the story is not set on Maple Street! Maple Street is the intersecting street at the end of the road the story is set on.
Something Hurt, Something Wild - S8-E1
Plot hole: Laurie Ferguson is outside the Ponderosa ranch with Joe Cartwright. In an attempt to frame him for sexually assaulting her, she begins screaming. She emits six loud piercing screams before the scene shifts to Ben, Hoss and her father and brother inside the home. It is not until her seventh scream that the four men look up and start to run outside.