Visible crew/equipment: When Jax and Clay are meeting with Alvarez (when they figure out the niners are branching out), the camera man is visible in Alvarez's sunglasses.
Continuity mistake: When Wayne pulls back the blanket to look at Piney's body, he doesn't cover it back up but when Wayne stands up, Piney is covered up again. Wayne is on camera the whole time so he couldn't have covered it back up.
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