According to Brannon Braga, The Adventures of Captain Proton holodeck program was influenced by Flash Gordon. Versions of the program also appear in "Thirty Days", "Bride of Chaotica!", and "Shattered". In the prequel series Star Trek: Enterprise (2001), a title called "The Bride of Chaotica" is one of the movie options for the crew's movie night, indicating that the holodeck program is an interactive version of a (fictional) movie.
Neelix orders Bergamot tea from the replicator to calm himself while hyperventilating, saying "Bergamot tea, hot." This is a reference to Captain Picard's preferred beverage; Oil of Bergamot is the defining ingredient in Earl Grey tea.
The game that Paris and Torres are playing in the mess hall, referred to herein as "durotta", has game pieces that are easily recognizable as pieces from the real-life game Quarto. While playing the game, the characters follow the rules of Quarto, as well.
In the String Theory trilogy, it is revealed that the Void was caused by Voyager helping to seal a rift in space that opened up to Exosia, the home dimension of the Nacene. As the rift was sealed, the space that it occupied in space/time changed to accommodate thousands of years of another history, and the absence of light is due to the photonic energy in that area having been drained into the rift and unable to regenerate at this time. The String Theory series also gives an explanation for Janeway's out-of-the-norm attitude, revealing that she had gone through a traumatic experience that caused her to suffer a minor neural imbalance that would leave her with periods of emotional struggles for the rest of her life.