Endgame (1) - S7-E25
Corrected entry: Seven of Nine knows about the existence of the Borg transwarp hub (and the fact that there are six of them), but she seems to have forgotten its location.
Corrected entry: The whole crew is forced into the Workforce of another society - but what of little Naomi Wildman? Where was she during all of this? Surely they didn't arrange for childcare.
Correction: Why wouldn't they? Surely Voyager can't be the first ship to arrive at this planet with children on board & they arrange other amenities for the workforce.
Corrected entry: In Chaotica's lab Chaotica throws Captain Janeway's hypospray away. Later when Seska takes her hostage we can see her hypospray.
Correction: After Chaotica throws away her hypospray, the scene cuts to Chakotay and Janeway in the hall. Perhaps she stopped to retrieve the hypospray before leaving, but it was not shown. Or they could have easily gotten another from the Doctor.
Endgame (2) - S7-E26
Corrected entry: The Borg Queen keeps insisting that Seven keep Janeway away from the Nebula, but both Before and After this insistence she says she doesn't care about Voyager and it can't possibly destroy the Transwarp Hub. Which is it?
Correction: She's the Borg Queen. Do you really think she would show weakness by admitting that Voyager was a real threat? She's just blustering.
Corrected entry: Gar is trading in iridium which is claimed to have a very short half life, allowing Tuvok to deduce how far away Gar could have gotten it. In reality, iridium is a stable metal and has no half life.
Correction: There are many radioactive isotopes of iridium. See http://chemlab.pc.maricopa.edu/periodic/Ir.html.
Corrected entry: At the beginning of the episode, the "Friendship 1" probe does a flyby. On it, you see Federation and Starfleet markings. During the briefing after the credits, Tuvok states that the probe was launched 4 years after Zephram Cochrane's first warp flight. Cochrane's warp flight was in 2063 and the probe was launched in 2067 The United Federation of Planets didn't exist until 2161, and even though there was techinically a Starfleet, it's well known that it didn't adopt the "arrowhead" (aka "Delta) style symbol until the 2240's.
Correction: Fan speculation and trivia generated in other media (novels, comics, blueprints, guides, etc) cannot be used to gauge a mistake. Mistakes only count if they contradict what was established in a previous film or television episode. And the date of origin of the arrowhead insignia has never been stated in any.
Correction: Seven is disconnected from the Collective and probably doesn't recall every detail from her experience. She likely recalled the number of hubs because it was an important fact, but the locations may have been less well known (or hidden from drones to keep their location secret if the drones were ever liberated).