Factual error: According to "The Doomsday Machine", full impulse drive is one-quarter the speed of light. In the first two movies, Enterprise used thrusters as opposed to impulse drive to leave Spacedock, confirming the notion that impulse drive is far too fast to leave such a (comparatively) small structure. Styles, however, orders Excelsior to one-quarter impulse, which is 18,750 km/s. In one second, she will travel half again Earth's diameter. From the time he gives the order to the time we see Excelsior clear spacedock's doors is approximately 40 seconds. Even allowing 30 seconds to go from rest to one quarter impulse, spacedock must be 13-15 times bigger than Earth! That's some serious engineering.
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Quotes
[The crew watches the Enterprise burn up in the Genesis planet's atmosphere.]
Kirk: Dear God Bones, what have I done?
McCoy: What you had to do, what you've always done, turned death into a fighting chance to live.
Mistakes
When Kirk and Kruge are fighting, a piece of the cliff breaks away and wiggles down the side of the cliff rather than falling like a rock. See more...
Trivia
Leonard Nimoy does the turbolift voice in the scene when Scotty says "Up your shaft", whilst exiting the Starship Execelsior. The end credits lists the voice under the alias Frank Force. See more...
Star Trek III: The Search for Spock (1984)
Directed by Leonard Nimoy, starring Christopher Lloyd, DeForest Kelley, George Takei, James Doohan, Leonard Nimoy, Nichelle Nichols, Walter Koenig, William Shatner (add more)
Star Trek III: The Search for Spock mistakes
Revealing: When Kirk and Kruge are fighting, a piece of the cliff breaks away and wiggles down the side of the cliff rather than falling like a rock.
Visible crew/equipment: When the Enterprise is exploding, a Klingon is shown flying over the helm. When he lands, a person's arm can be seen on the right side of the screen, trying to grab his foot.
Star Trek III: The Search for Spock trivia
At the beginning of the movie Kirk rescues McCoy from a jail of some sort. Before leaving Kirk asks McCoy how many fingers he's holding up and does the Vulcan hand thing. However, Shatner had severe difficulties putting his fingers into place, they just wouldn't hold into position. So the crew wound up wrapping fishing line around Shatner's fingers, he would put them into position out of the camera and the shot quickly jumped while his fingers where still in place. If you look closely you see the line around his fingers. (Note that this problem occurred several times during Star Trek, actually, Nimoy and Leonard seem to be the only people doing this without a problem.)
Spock's coffin is a photon torpedo capsule with "Mark VI" written on the top. Mark VI is the chapter in the Bible which relates the raising of John the Baptist from the dead.
Leonard Nimoy does the turbolift voice in the scene when Scotty says "Up your shaft", whilst exiting the Starship Execelsior. The end credits lists the voice under the alias Frank Force.