The life and family of Dr. Noonien Soong were explored several times in Star Trek: The Next Generation (1987). No mention was ever made of him having a biological son. He and his wife considered Data and Lore to be his children.
It is said that Narek was able to follow La Sirena by extrapolating from their last known trajectory. La Sirena's last known trajectory before Narek lost them was heading to Nepenthe, not the Borg transwarp conduit. After Nepenthe, La Sirena headed to Deep Space 12 before rerouting to the conduit. There would be no way for Narek to have extrapolated a heading to the transwarp conduit when La Sirena changed headings multiple times to get there, and didn't even know that was where they were going until well after they'd lost Narek's ship.
On the bridge of the warbird Oh is commanding, the Romulan officer refers to her as "Commodore." As a double agent, that is her rank in Starfleet, but her rank in the Romulan Tal Shiar/Zhat Vash is General, and her cover has clearly been dropped.
Arcana mispronounces Jana's name as "Janner", a sign of Jade Ramsey's English pronunciation slipping through.