^ Katic's hair is getting longer each season. They're making her more girly to pump up the sex appeal. Sort of like Katee Sackhoff on Battlestar Galactica.
When Beckett was watching Castle uncover the counterfeit bills, I was gonna post on this thread if it was obvious she already knew and was losing the bet on purpose, but then Esposito came right out and said it at the end. I guess one thing this show is not is subtle.