An often overlooked bit of trivia is that this episode is the sole "return" appearance not only of Kes, but also of Samantha Wildman, played by Nancy Hower. Samantha, mother of Naomi, was a fairly important recurring character in early seasons, but was otherwise unseen after Once Upon a Time (1998). An urban legend says that the writers incorrectly remembered the ending of OUaT, where the injured Samantha is narrowly rescued from danger, and assumed that she had been killed off.
The Doctor states to Janeway that, as Ensign Wildman is carrying a half-Ktarian child, her pregnancy period is doubled. This confirms what many fans assumed to be the reason for Ensign Wildman's longer-than-normal pregnancy (which had lasted a year and a half in "real time").
This is the third and final episode to include the complete cast of the show from all seasons. The previous two episodes to do this were Scorpion, Part II (1997) and The Gift (1997).
The scenes where the corridors explode as Kes walks past were filmed with Jennifer Lien walking on a treadmill.
This is the only episode where any direct interaction occurs between Seven of Nine and Kes, with a single line from Seven to Kes: "State your intentions."