Crucifixed - S5-E10
Deliberate mistake: When Tara is talking to Gemma in the parking lot of Stockton Prison, the chrome bumper of Tara's SUV is blurred out, probably to cover up visible crew and equipment. It looks unnatural, since the image is sharp enough that you can see the radiator itself behind the grille, and the numberplate is perfectly sharp.
Crucifixed - S5-E10
Continuity mistake: In the scene where Otto kills the nurse with the crucifix, he breaks it off his neck (cross and necklace) In the shot when he stabs the nurse it is back on his neck.
Chosen answer: The First 9 wore these, as can be seen on old pictures. They later switched to leather, but Piney just never did.
Friso94