Trivia: Kriste Alley turned down the role of Savvik in star trek 3 & 4 for fear of being typecast.
Trivia: In 1983 this movie held the record for all-time best-selling home video release, largely owing to a then-bargain $39 price point. In the early 80s most movies on tape were priced around $70; the belief was that only enthusiasts and high-end customers were interested in owning movies and most people were satisfied renting. The stellar sales of Star Trek II proved there was a mass market for home video sales and the entire industry shifted in response.
Trivia: Early storyline development used essentially the setup for the Star Wars films only the villain was on the side of the rebellion. David was a (villainous, initially) version of Luke and it was a plot twist that Kirk is his father. The Genesis device was a planet-destroying weapon a la the Death Star, Khan lurked in the shadows dressed in a cloak and used psychic powers like the Emperor, and Spock would have died in the middle and at the end speak from beyond the grave like Obi Wan Kenobi.