Revealing mistake: "Stop When Red Lights Flash": In the cell with Kate, Weston puts on his mask, making only his head visible. But the blue-screen matte used for this special effect is, weirdly, showing through his blue eyes.
Revealing mistake: "Man of Influence": Weston sends the big black Lincoln Continental over a cliff. It's still a Lincoln on the way down, but then stock footage cuts in as it explodes, and it's suddenly a completely different car.
"Sight Unseen": Wells has the key to Lori's shackles. Weston, who knows this, knocks Wells out, but instead of taking his keys, uses a completely unnecessary (and considerably more difficult) set of bolt cutters to break the leg cuffs.