To trigger this ending, go to 1999 AD (Epoch, Bucket, or Black Omen) after returning Chrono to life or after finishing all the side quests. This unlocks All Movies except #3; Endings. Variations:

If you killed Magus in your second meeting, Frog will be Glenn again.

If you didn't enter the code in to the machine at Lucca's House to save her mother, she will be sitting instead of standing.

In the Castle throne room 1000 AD, if you freed the Chancellor after beating the second Yakra, he will be there. If not, your lawyer Pierre will.

If you went to 1999 AD by way of the Epoch, Crono & Marle will fly off with balloons. If not, your cat(s) will disappear through the time gate.