Except for huge plot twists like Darth Vader being Luke Skywalker's father, sure.But I'm inclined to compare the classic cast Star Trek movies to the Star Wars movies, from a production standpoint. My impression (as a non-fan) is that the SW films were made with care for keeping the world consistent and character continuity intact.
No, the Star Wars films were like anything, made up as they went along & evolving over time. George Lucas just likes to pretend that he had a grand plan from the start.
Because it wouldn't have added anything to the story they were telling. They could have listed every other relative of Kirk, Spock, and McCoy's during the "Other men have families" exchange, but all it would've done is dilute the point that at that point in their lives, Kirk, Spock, and McCoy were each other's family.As far as The Final Frontier, two episodes were directly "quoted." So that had to show someone was paying attention. McCoy's reused a line from "The Corbomite Maneuver" and Kirk did the "Tall Ship" thing from "The Ultimate Computer." I'll go so far as to give David Loughery credit for those since he was the primary screenwriter. So if he did enough research to pluck out those lines, why not allow him one more with a Sam reference?