When the Bridge crew accesses the manifest of the Senior officers, it reveals the birth dates for most of them on-screen: Jean-Luc Picard, 13 July 2305; Data, Activated 2 February 2238 (an error; it should be 2338); Geordi La Forge, 16 February 2336; Deanna Troi, 9 March 2336; Beverly Crusher, 13 October 2334; Ro Laren, 17 January 2340.
The camera cuts away when the computer reveals the birth dates and biological info for Will Riker and Lt. Worf, but that information is revealed in other various episodes (Riker was born in 2335 and Worf in 2340).
The Lysian Central Command was previously used in Justice (1987), where it played the part of the Edo God. It was not as detailed in that episode.
This story grew out of several amnesia stories pitched by the writers a year before. Executive producer Michael Piller felt the episode didn't quite do justice to the original pitch, which involved drafting soldiers by rewriting their memories. This storyline was later used in Workforce (2001)/Workforce, Part II (2001).
This episode won an Emmy Award for Outstanding Individual Achievement in Special Visual Effects, sharing it in a tie with A Matter of Time (1991).
Liz Vassey: Kristin, the diver in Sickbay. This is the only Star Trek appearance for Vassey, who went on to have significant roles in sci-fi-fantasy series The Tick (2001) and Tru Calling (2003).