This is the first episode Rule #62 appears in.
Rule #62: Leave room for someone exiting the elevator.
Ellie asks Dr. Cranston if she knew the previous occupant of the desk Ellie has been allocated. Dr. Cranston says she knew both. The last occupant was Ziva David, her friend. The previous occupant was Kate Todd, her sister.
Though they don't share any scene together, this episode features Wendy Makkenna and Alanna Ubach. They both worked together 20 years ago in the movie Sister Act 2: Back in the Habit (1993).