• Commander Tysess refers to Doctor Noum as a counselor. He was chief medical officer aboard the USS Dauntless, but presumably that duty has fallen to the Doctor aboard the USS Voyager A.
• Tysess claims the cloaking device aboard the Infinity violates three Federations treaties. We’re aware of the Treaty of Algeron with the Romulan Star Empire. That treaty was first mentioned in “The Defector”, and it’s established in “The Pegasus” that in explicitly prohibits the Federation from developing cloaking technology.
• Rok-Tahk creates a hologram of the bridge of the USS Protostar, which was destroyed in the finale of season one.
• After Rok fiddles with the Protogies holographic duplicates, they believe they’re the real individuals, leading to shenanigans. Other holograms that have believed themselves to be real people include:
• Cyrus Redblock - “The Big Goodbye”
• Leonard da Vinci - “Concerning Flight”
• The population of Fair Haven - "Spirit Folk"
• The Protogies end up getting into physical confrontations with their holographic duplicates -- except Rok-Tahk, who just just does a bunch of science with her hologanger, like a nerd. Trek characters have been fighting their doubles since "The Enemy Within". Fortunately Spock is not around to express to Gwyn that there's a certain allure the aggressive version of Dal.
• Maj’el distracts the Doctor by asking him about his willingness to give opera vocal lessons, and he asks if she’s ever heard him sing “Questa o quella”. The Doctor sang that piece in “Renaissance Man” while returning to the USS Voyager with Janeway aboard a shuttle.
• Maj’el uses the same tactic to distract the Doctor that Zero did in the previous episode, engaging him in one of his interests.
• Zero asks Maj’el why she would lie on behalf of the Protogies, and she responds ”Vulcans lie all the time,” which is surprisingly honest.