Uncripple Lucca's Mother:
When Lucca wakes up in the middle of the night (after the whole rebuilding the forest thing)she will hear some weird noises. Go to the screen to the right and enter the gate. You will apear at Lucca's house the day her mother was crippled. Walk down the stairs and you will see how it all started. When Lara (Lucca's mother) get's stuck, go to the flashing light. When it ask for a code, press the left, "A", right, and "A" button to stop the machine. If you do this correctly Lara won't be crippled in the year 1000AD.
Most people already know this, but if you say no to fighting Magus at the North Cape he will join your party (trust me he's worth it!)
The Black Chests:
First, to open them you have to power up Marles pendant, which is easy. All you have to do is use the mammon in Zeal Kingdom (the screen glows if you do this correctly). Then go to the time period you wish, find the chest and open it. If you say no to the ones in 600AD you can get a power up of that weapon/aromor in 1000AD. If you do this you can also go back in time to 600AD and get the other chest you said no to.
Pouring The Coke On Toma's Grave:
Is it just me or does it look like Crono is pieing on the grave when you go to pour the coke on Toma's grave (this looks extremly weird if you have a girl in your party).