Going by what we've seen in stills, here's what was (regular text) and probably wasn't (in bold) shot:
- Spock exiting the Enterprise, making his first report
- On the bridge, Kirk learns Spock has left
- Spock concentrates, then jets himself down to the trench (model/miniature work to be provided by Robert Abel)
- Kirk argues with McCoy in the airlock
- Kirk exits the Enterprise
- The original longer 'Ilia at the mirror' scene goes here
- Kirk follows Spock down to the trench (model/miniature work to be provided by Robert Abel)
- Kirk attacked by 'sensor swarm' (using wire footage shot in reverse)
- On the bridge, Sulu, Chekov and Uhura beg Spock to help Kirk (not sure if actually shot or not)
- Spock shoots the sensors off Kirk, the two have it out
- Kirk and Spock fly to the inner wall, watch the sensors fly in
- Spock catches a sensor, lets it go
- Kirk and Spock follow the sensors inside
- Kirk and Spock enter the Memory Wall chamber, fly to the newest memory crystals
- Spock tries to mind-meld with a 'Meditator Ball,' with predictable results
The biggest missing piece of the puzzle here, obviously, was the glittering flying sensors to be animated by Robert Abel. Without that, the other visual effects, music or even ADR by Shatner/Nimoy, the raw footage would have looked mighty poor indeed. Especially if the wirework flying Shatner/Nimoy around wasn't up to snuff.