The Dark at the End of the Tunnel - S2-E12
Visible crew/equipment: When Frank closes the door to the shed, you can see a crew member in the trees to the right swaying left to right as if he were looking for something. (00:45:15)

Visible crew/equipment: Wesley enters Vladimir's office to talk with him and Vladimir had a large white window behind him. As they talk, the reflection of a green screen of these windows is in Wesley's glasses. (00:06:34)
Visible crew/equipment: A random hand appears on the left side of the screen when Matt is punching Fisk. (00:33:59)
Chosen answer: Castle picks up the newspaper from the pile of mail and carries it to the table. There don't seem to be other newspapers in the pile, and there should be more given how long he was away, so perhaps only that issue was put through the mail slot. Karen may have done it, but she seems to still think he was dead at that stage.
Sierra1 ★