The character of Dr. Miles Wolf was written because Wendy Makkena was unable to reprise her role of Dr. Rachel Cranston as she was busy filming The Mob Doctor (2012).
It has incorrectly been said that Tyler Ritter has replaced Daniel Louis Rivas as Abby's brother. Daniel plays Abby's brother, Kyle, who she only just discovered after finding out she was adopted. Tyler will be playing Luca, her adoptive brother.
This episode of NCIS "reunites" Sean Murray (Agent Timothy McGee; regular cast member) with guest-star Larry Bagby. Both men appeared in 1993's cult classic Hocus Pocus (1993) - though not sharing any scenes.
When Ziva lays out the three pistol photos it included a picture of a Colts woodsman which was never made in a .32 cal.