Continuity mistake: When Ray talks to Alan, there are red binders behind Alan. The one on the end switches from being tilted and leaning up against the other book to standing straight up, depending on the camera angle.
Continuity mistake: When Sara, Mick and Zari get to the control room, Sara is wearing the sleeves of her coveralls down. In the next couple of shots she has them rolled up to the elbows, and then down again. (00:19:05)
Phone Home - S3-E4
Continuity mistake: When kid Ray opens the backpack, it's set so it's behind him. The baby Dominator comes out and takes a few steps forward, away from the backpack. In the next shot, he's barely a step away from it and it's now in front of kid Ray.
Continuity mistake: When Sara rejoins the crew at the end of the episode, Nate lifts his left hand to his face and hollers. In the next shot, he has his right hand to his face instead. (00:40:25)
Continuity mistake: After Leo makes his "heartfelt confession" to Mick and Mick says he wasn't listening, the glass skull on the desk moves position between shots without either of them touching it.
Visible crew/equipment: After Jax cuts the rope that's supposedly keeping the trap in the air, as Marty falls to the ground you can see the cable that is actually holding the whole contraption up while the rope falls a bit to the right.
Chosen answer: Black Canary, Spartan, Wild Dog, and Ragman.