I already addressed that point. The characters discussed whether the events happened as depicted, and they agreed they did. I very much doubt Spock or Pike would have
misremembered that the top of the bridge was a transparent dome, as shown in the images.
As to whether there are shipboard cameras,
there are, as established in "Court Martial". In "The Menagerie", it is also stated that cameras can record images aboard ship; the quality of what they seem to be watching on-screen during Spock's court martial is stated to be better than the quality of what the shipboard cameras can record.
So, it was not the Starfleet shipboard cameras that recorded the images. Therefore, the Talosians scanned the images that are presented on-wescreen in "The Menagerie". If they did it entirely out of what's in the minds of Pike's crew, then that's a bit more evidence in favor of the idea that the bridge really has the transparent dome on top, as depicted in the images recycled from "The Cage", because it would look the way that the crew thought it did.