Dr Reyga is the first example of a sympathetic Ferengi--one who isn't motivated entirely by profit. This would later be explored further in Star Trek: Deep Space Nine (1993) with Rom and Nog (and to a lesser extent, Quark).
Final appearance of Guinan (Whoopi Goldberg) until Star Trek: Generations (1994) and Star Trek: Nemesis (2002).
James Horan has appeared in all four Star Trek spin-off television series. He played Jo'Bril in Suspicions (1993), Lt. Barnaby in Descent (1993), Tosin in Fair Trade (1997), Ikat'ika in In Purgatory's Shadow (1997) and By Inferno's Light (1997) and "Humanoid Figure" in Broken Bow, Part 1 (2001), Cold Front (2001), Shockwave, Part I (2002), Shockwave, Part II (2002), and The Expanse (2003). In addition he lent his voice to the video games Star Trek: Klingon Academy (2000) and Star Trek: Starfleet Command III (2002).
More than half the episode is told in flashback.