I just re-watched Star Trek Wrath of Khan over the weekend and they did such a great job on that movie. They are like only 3, maybe 4 scenes in the whole movie that isn't a battle, someone in danger, or anticipation of future peril. The special effects are great, the settings are great, and the bridge looks awesome.
Now I'm watching Star Trek III.
All the screens on the bridge have the old TV schematics for the Enterprise and Commodore 64 style graphics. After seeing the sweet graphics on the bridge in Wrath, it's just glaring.
Saavik, of course, is a different actress. I wish they would have just made her a different character. And somehow she's now a Command Officer (the white undershirt), but still a Lieutenant.
The guy that played David is acting completely different than he did in Wrath.
The story is great and the outer space special effects are much better than Star Trek V, but a bunch of things are standing out as being low-budget or just counter to the previous movie.