SPOILERS
Is that there are often things that aren't said outright but are hinted to. Also, certain things are foreshadowed, but not directly. One example could be NORG in FFVIII a lot of people think that the part where he takes over the garden is the first time he's ever been mentioned, it's not. He is mentioned on a page in the computer in the classroom right at the start of game (the actual page escapes me but it's there.) Similar we had Necron in FFIX, people think he just came out of nowhere with out any explanation - again it has been hinted that he exists.
Two of my favourites (as most of you have probably noticed) are both in FFVIII, the orphanage scene, and Squall's change in personality.
The fact that the team all knew each other (as well as Seifer and Edea) as kids (Edea was an adult) is hinted within the game, just very subtly. I shall either list them here or in a separate post. I am stopping here because I am tired, but I wanted to get this thread started.