Re: What's with all the Union Jacks in the trailer?
Of course, the Cuba flag is displayed in the courtroom in The Menagerie
Perhaps Commodore Josť Mendez is from Cuba and it was displayed because he was presiding over the court?
"STAR TREK is... Action - Adventure - Science Fiction."
-- Gene Roddenberry, 1964, top of the first page of his original pitch and outline for Star Trek