Revealing mistake: When Dr. Railly is tied to the bed in the motel, her bonds are not very secure. In her struggles, she very nearly frees her right foot, by accident.
Revealing mistake: The paint in the "we did it" lettering in the roaring bear scene runs "downwards," according to the camera position, not according to the vertical of the shot buildings. (01:51:15)
Suggested correction: While yes there are slight angles involved, considering this was most likely a physical prop on-set, the direction of the camera tilt wouldn't be a factor. The direction the paint runs in doesn't seem wildly inconsistent with what would happen when painting something like that.