(at around 1h 16 mins) Toward the end when Alex is being punched by the "Puppet Master" his mouth is bloody. Then Megan smashes a vase on The Puppet Master's head, and in the next shot Alex's face is no longer bloody. In the next close-up of him the blood has returned.
(at around 5 mins) When the puppet Blade is racing around the Bodega Bay Inn grounds, he runs towards the street and stops at the curb just when a car nearly runs him over, and we see the side of the tire. But when the door opens and the two assassins walk out, we see nothing near the car where that doll should be, nothing even close to the car. After that overhead shot, the POV shows him running from behind the tree but there was no time to get there.
(at around 51 mins) When Frank and Carissa are having sex and Carissa notices the door is open, her hair moves from hanging over her shoulder to behind her shoulder.
(at around 10 mins) When Toulon puts Blade in the trunk, the hook is his right hand, while every other time it is his left, the knife being right. This shows that this shot was flipped.
(at around 55 mins) When Dana is walking down one hall with Leroy and a bottle of champagne, the exit sign is backwards. Another indication that this shot was flipped is that the bottle of champagne and the dog switch hands in the very next shot; which isn't flipped, and was filmed in the same hallway.
(at around 57 mins) When Dana cleanses the dead Gallagher's aura he clearly blinks. When she closes his eyes you can see his eyelids flickering.
(at around 5 mins) In the beginning, when the puppet Blade is racing around the Bodega Bay Inn grounds, he runs over to a pulled up car. When the door opens and the two Nazi assassins walk out, you can see three crew members in the car door window reflection; two of them are down on their knees operating the camera in place of Blade's bird's eye vision, while the third is standing on the grass watching over.
(at around 50 mins) Frank and Carissa are first seen having sex you can see a crew member to the right sitting on the floor.