Q tells Q Junior not to provoke the Borg. It was Q himself who first introduced Starfleet and the Federation to the Borg in Q Who (1989).
Q considers Jean-Luc Picard when they doubt the choice of Janeway as Junior's godparent. Q and Picard had eight memorable adventures together in Star Trek: The Next Generation (1987).
This episode was directed by LeVar Burton, who played Geordi La Forge in Star Trek: The Next Generation (1987).
First time Icheb (the present-day version) is seen with a com badge.