I was playing FFVII last night and had gone through Gongaga and Cosmo Canyon. In Gongaga, when you have Tifa and Aerith in your party and you get the whole walkout scene, the girls will say something additionally depending on your affection points (
date mechanics).
From
this script, Tifa should say "You know...I'm as proud of Cloud joining SOLDIER as if it were me."
Aerith should say "I was hoping maybe you were..." if you say you are "...jealous...envious..."
I knew my value with Tifa was high (as I wanted the date with her this time, as it was Aerith the last time - Barret and Yuffie for later playthroughs), whereas I knew Aerith was not as high. The value needs to be 120, according to the link. Tifa did say this line for me, whereas Aerith did not.
I should also note, especially since the spotlight is on Nanaki right now, he will say different things at different scenes, depending on whether or not you have beaten the Cave of the Gi - this is to reflect on how, as he says, "he has grown up a little". One prominent example is during the recruitment of Yuffie. If she steals from you, he comments on how greed is a perfect example of human nature. But, after the sealed cave, he will instead say something like "give me back what is rightfully mine". The lines are different at Fort Condor too, and from memory it's nothing too different, save for one where he asks the people of the fort if they are going to protect the egg, whereas after the cave he says how
we're going to protect the egg - he's more decisive on taking action himself. (I know the script is right in front of me to double-check, but I'm sure enough I'm right on these accounts
- I've been following it throughout my latest playthrough).
And, indeed, the scenes in Gongaga are similar too [which can be hard to miss, since you can leave it too late, of course] - he is less cynical in tone about the Turks waiting for them, where he says how "they have been waiting for us" and "someone's been informing them", whereas after the cave he phrases it more as a question, like "Cloud, how did they know we were here?" and "you think someone told Shinra about us".