This episode is unusual in that it is told from the viewpoint of a guest character rather than one of the Voyager crew (who don't even appear until well into the second act).
Voyager's crew complement, as of this episode, is 149 (148 stated life signs plus The Doctor)
The throne chair that Minister Odala sits on was later reused as Doctor Chaotica's throne in Bride Of Chaotica! (1999). It was originally created for Coneheads (1993).
The canister of warp plasma that puts Gegen on Voyager's trail was the canister traded at Bahrat's space station in Fair Trade (1997). Even though it was actually a "lower grade substitute", it still puts the Voth scientists on the right track.