Trivia: Across the hall from Nelson and Murdock is an office that reads "Atlas Investments", a nod to the comic company (Atlas Comics) that would later become Marvel. The logo is the same as that of Atlas Comics too.
Trivia: Wilson Fisk's code-name of Kingpin isn't acquired until season 2. However, his eventual nom de guerre is foreshadowed in season 1 by the way of Ben Urich's cork-board in his office, which features a king of diamonds playing card pinned to it.
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 ★