1) I agree with what Big D said - Squall's confrontation with Griever was just for dramatic purposes, and was Ulty's tactic of intimidation.

2) Upstairs it most definately was.

3) I'm a big fan of the theory that Raine's last name was Leonheart, and it does make sense - since Raine died giving birth to Squall (or so I believe), the people of Winhill most likely gave him his mother's surname, since Laguna had skipped out of town looking for Ellone and they never really liked him much anyway. They did, however, think the world of Raine, and I doubt they would have sent him off to the orphanage without some peice of his mother, even if it was only her last name.

4) Most likely, Trabia was a shelter, just like the Balamb and Galbadia Gardens. However, if you recall when the teams split up after escaping the prision, the missiles had already launched at Trabia. Irvine says something like, "I heard they we're launching at Trabia first, then Balamb." Then, missiles are heard launching in the distance. Supposedly, these are the ones that head for Trabia Garden. There isn't even any time to warn the students to evacuate, much less to morph their Garden - something Squall and everyone else don't even know about yet. Selphie wants revenge, so that's why she insists on being assigned to the missile base team. They try to deflect the missiles from Balamb while Squall and Co. go to warn the students to evacuate. It isn' t until Cid mentions something abotu machinery that the Garden is transformed, and even the headmaster wasn't sure what would happen.