Revealing mistake: In the scene where Norman visits Caleb at the motel on his own, after hearing Norma and Dylan argue, he gets into an argument with Caleb. Norman then pulls a knife out high above his head, at which point you see it is a prop/rubber type knife. The handle aimed at Caleb but the force Freddie Highmore has used to pull the knife up and back causes the blade to bend and aim toward the ceiling.
Audio problem: After Deputy Lin drops the line "we'll get the results back fast," Sheriff Alex Romero responds with "I'm not sure how much nail clippings are gonna tell us." As he sits down, his mouth movement matches the audio, but when the angle changes, his mouth isn't moving at all. (00:09:55)
Visible crew/equipment: After Norman runs from the men that have him captive, Norman is dragged back to The Box. As he is being dragged you can see the mic cord across his stomach.
Continuity mistake: In the woods after Norma takes the gun away, as she's talking to Norman; her hand changes between shots from resting around his neck to around his ear, with her thumb placed in from of Norman's ear. It changes about 6 times.
