Continuity: When Nick is driving Elizabeth home, he mentions buying her a ring. The steering wheel is the standard hard plastic type found on trucks of it's era. When the glass shatters and the truck comes to a halt, the wheel is suddenly padded with a black, aftermarket wrap.

Continuity: As Stevie's car settles to the ocean bottom, an exterior shot looking at the front/driver-side shows her door mirror is missing. But when she wakes up and looks around, the mirror is on the door.

Revealing: When Stevie's car is hit by the delivery truck, the side shot that shows the car beginning to roll reveals there is no engine in the car, as we can see through the front fender wells to the truck as it passes on the far side of the car.

Factual error: It's been established, that the burning of the lepers ship happened in 1871, yet when one of the city's "founders" pulls his gun on Blake, it's an 1873 Colt Single Action Army, a gun that didn't exist 'til two years later.