The Magician - S3-E4
Revealing mistake: When Oliver meets Thea at the Grind and Jot Cafe (Which looks unsurprisingly like CC Jitters) you can see the cups on the table are from CC Jitters. (00:20:50)
Continuity mistake: After their victory, the Turtles are celebrating and partying. Just before the episode ends, Leonardo is dancing on a white mat and doing the moon walk. It cuts to a higher angle and suddenly the white mat vanishes.
Continuity mistake: When Lin lifts the rocks around the house in the final scene, there are eleven of them. But in the last shot, there are only eight rocks.
Continuity mistake: Dio challenges some hoodlum at the game that men of dubious virtue would play in the London slums at the turn of the century; chess. He reaches over to grab the coins the guy tossed at him, but when the sore loser smashes his face in the grub, the dish is suddenly directly in front of him and the chessboard disappeared. (00:03:10)
Second Time - S2-E13
Character mistake: When Kiera is begging one of the Freelancers to send her back she says she could "prevent Liber8 from ever coming to 2077." She should have either said "coming to 2012" or "leaving 2077."
Visible crew/equipment: When Rebecca Madsen jumps in her car to pursue the armored truck, as she does a U-turn and takes off at high speed, you can see all the people standing on the side watching the filming. Some even have their phone cameras out videoing it. (00:29:30)
Episode #2.4 - S2-E4
Continuity mistake: When Jacqueline raises a hand in response to her name being called, she puts up her left hand. A shot later, she has her right hand up instead.
Continuity mistake: Before and after the Beetle's battle armor is fried by May Parker activating the jet engine, the appearance and arrangement of the building in the background changes between shots.
Revealing mistake: When Grapefruit cannonballs into the pull, it splashes on Pear. But no sign of any wetness is seen at all on him or the diving board.