Sergeant John Munch greets guest star Andre Braugher telling him "I admire your second act". They had both appeared together before as detectives on Homicide: Life on the Street (1993), which is the series where Richard Belzer first played the character of John Munch.
Part of this story is later continued in Wonderland Story (2013), with Sofia Vassilieva reprising her role as Sarah Walsh.
Kevin Geer (Sarah Walsh's father) is a long-time guest-star veteran of the Law & Order franchise, playing nine different characters on ten episodes throughout the different series. His appearances include:
- Charm City (1996) as Brian Egan
- For God and Country (1996) as Brian Egan
- Capital Punishment (1998) as Maloney
- Sacrifice (2001) as Phil Kastner
- F.P.S. (2004) as Local Detective
- Saving Face (2005) as Jules Livanski
- Steel-Eyed Death (2010) as Mr. Evans
- Conned (2010) as Belton Merrell
- True Believers (2011) as Mr. Walsh
- Townhouse Incident (2016) as Assistant Chief Gabriel
Andre Braugher, who played Ellias, also played the cop investigating a serial killer on the homicide table in the movie Frequency (2000).