I'm starting another play-though of Chrono Cross today, and I immediately notice something odd. When you speak to Marge a second time, she says this and you are given two choices:
Weren't you supposed to meet Leena this morning? Hurry along now and go apologize to her. Don't expect me to stick up for you if Leena ever decides to blow you off. You wouldn't want that, right?
*She'd never do that!
*That would be bad...
The choices appear to have no impact on the game, but they do (albeit a microscopic one). In the lower left of Serge's room (near the bottles) is a bunch of 5 Tablets. If you neglect to pick them up, then talk to Marge and select the second choice, the Tablets disappear. It seems utterly pointless, but I thought I'd share.