After the audience with the Emperor, don't go home. Instead, go to Sarady and talk to the man in the upper-right house. You'll get a Fortune Rune.
Alternately, go home and as soon as Ted joins the party, go to Sarady and talk to the man in the upper-right house. You'll get a Prosperity Rune.
Try to leave Kraze's mansion without talking to Pahn.
Accept to kill Kwanda at the first option for an extra scene involving Windy.
Accept to kill Milich at the first option for an extra scene involving Camille.
Try to enter Kaku by boat, after the first battle with Teo.
When you return from Kirov with the fire spears, enter the castle by boat.
After being denied entrance to the Dragons Den, enter Antei with less than 200 bits and speak with Vincent.
Take Liukan with you, on your first conversation with Joshua.
Return to the old liberation army's hideout the time you can re-enter Gregminster area.
Enter the lower left house in Lenankamp with Meg in your party.
Talk to the guy on the second floor of the inn at Lenankamp with Krin in your party.
Check on a tombstone in Rockland with Clive in your party.
Visit Sonya right after Teo leaves the house for the first time.
Check on the diaries of Pahn, Cleo (looked), Sonya and your own (save point).
Talk to Kraze over and over again (up to six times), after receiving instructions for the Rockland mission.
Talk to two men in Rocklands inn with Kanaan in convoy.
Take the captured bandits with you to Kraze instead of Grady for some additional lines.
Krin can be found in the upper left house in Lenankamp at the beginning.
Talk to Onil often, for different hints and comments throughout the whole game.
Leave Kouan, the night Krin is waiting for you outside of Lepan'ts mansion, re-enter and talk to him at the inn. Also, you can get another comment if you back out of sneaking into Lepant's mansion (from the roof) after Krin sets you up to go in.
Talk to Jeane, Lotte, Qlon, Sarah, Zen and Morgan with a level 2 castle, for some quotes you may have never seen before (keep your recruits to a minimum).
Talk to Anji at Pirate's Island with either just Tai Ho or just Yam Koo in your party.
Talk to a guy in Warrior's village with Flik in your party.
Check on Chandler's and Chapman's goods at your castle, if you have never visited any item and armor store at all.
Rest at one of the coffins at Neclord's castle.
Both bring an Escape talisman along, when they join your entourage. These two can be used infinite times, as long as you don't drop them in your storehouse ever. They have an "infinite" flag like the Blinking Mirror that will be corrected, if stored. You can hand them over to your comrades, though. (Not that you wouldn't be bombarded with these items ingame either way)
Note that this trick only works when you meet him in Rockland.