My rudimentary list for TVH. Don't hesitate to correct me.
The famous prologue. Only thing to note here is that the score seems to just be an assembly of different Rosenman pieces.
A scene at Starfleet HQ showing Janice Rand once again.
Chapel meets Sarek outside the council chamber and tells him he's not too late.
Sarek is briefly interviewed by the Federation press.
Saavik and Kirk discussing her pregnancy.
A scene where Chekov's surgeon asks why Chekov hasn't been prepped for the surgery.
The famous scene of Sulu and his young great-grandfather. Never actually filmed due to child's stage fright.
P.S. Keep checking the first three lists, I'm constantly updating them.