I, Witness - S7-E13
Revealing mistake: When Castle answers his phone at the start of the episode, his phone is on the lock screen instead of in call mode.
Revealing mistake: At the beginning when the murder victim falls through the ceiling of the elevator, there is a bag of blood that show right behind his head.
Revealing mistake: When Detective Ryan calls Captain Gates after apprehending Jerry Tyson at Michael Boudreaux's apartment, Ryan's phone is not in call mode.
Answer: The networks are now having winter breaks. A mid season end of new episodes, when they come back after the new year, it picks up as if several months have gone by. Beckett suggested Valentine's Day as a "chick flick" to watch as she is moved in. Also some episodes are not scheduled to air in order.