In entrechment, building a star base in system colonized by another party results in a crash a few seconds after the building starts.

Culture spread and distance to the home system is not counted over wormholes if the planet has no connection to the star (direct or indirect). And stars in these maps are sometimes not shown at certain zoom levels.

Ships taken over by keep there (movement) order, including jumping back with their once fraction and now enemies.

Owning to many planets messes up the income lists (money and resources) you see then hovering over the amount.