Archie thought they owned all the characters from the Sonic the Hedgehog comic, but when they took Ken Penders to court, they found out the paperwork was misplaced. Auditing for specific parts of the IP is tractable; maintaining confidence in everything would be onerous. More so for series with multiple authors introducing characters and plots.

When they’re disguised as an Andorian, yes.

There are also scenes with Cardassians that look like Bajorans, a Bajoran that looked like a Cardassian, a human that looks like a Malcorian, and a human/Betazoid hybrid that looked like a Mintakan,

She played the captain of the Lakota later in DS9, Captain Benteen.

The first time they introduced the Eugenics Wars set in the 1990s, Spock called it the last world war. Pike in SNW elaborated that it was part of the escalating conflict that went nuclear as WW3 decades later.

I’d say TNG mostly stopped exploring new frontiers halfway through season 1. Farpoint promised exploration, but soon the ship is ferrying diplomats and scientists and answering Federation distress calls. The worlds are new to the audience, but not the characters.

She directed episodes of both “Enterprise” and Star Trek: Enterprise", which each lasted two seasons. The stealth name change was surprising back then.