If you set the game to PvP, be careful using your own catapults as they can damage you. If they kill you the reason for death is stated as "Winona´s catapults"
If you are fighting Dragonfly, do not exit the game and return, as it can deaggro and leave the battle inmediatelly when you return.
If you manage to capture Bearger (in a lunar island or trapping him using lureplants for example), unless set for more beargers in the game settings, there will be no more instances of him. Making autumm much safer. Unlike deerclops, bearger doesnt despawn.
Rockjaws doesn´t like being on any ground. If spawned using control commands, it will flail it´s way to the nearest ocean, using any sorts of constructions are ineffective, stone walls are destroyed, end tables and fossils are jumped over, lurelants are jumped over and destroyed.
If you spare Klaus´s gem deers, those will never grow antlers, and will not create a pack.
Hounds spawned by a varg are not hostile to the player by default, they will only attack if the varg targets you. The hounds will always try to stay next to the varg.
Pigmen, just after waking up after a full moon, will destroy any obstacle between food and them.
Antlion is the only seasonal boos to not use the seasonal boss music, if you fight treeguards, spider queens and/or bearger, the music will be different.
All bosses have now sculptures, minibosses like treeguards, posion birchnuts and spiderqueens do not.
If you equip a spider hat just right before a spider attack connects, all the other spiders will attack your attacker, making a potential civil war.
If a damaged clockwork rook smashes broken clockworks and spawn another clockwork creature, the spawned clockwork will attack the rook, but will still be hostile to you though.
Crabking is the only boss that cannot attack you directly, so using any armor is usless, on the other hand using a warming piece of clothing may help against it´s freezing attack.