- The blue flash indicates an attack can be parried, but the timing on it is misleading. You actually want to watch the enemy attack animation and press the button just as it makes contact instead. The basic enemies where they teach it to you are also particularly bad targets for it, some later enemies telegraph their attacks better and it becomes more worthwhile to do as enemies get tankier.
- If you're a completionist, there's destroyable flying TVs that count toward your item %, but don't get marked on the map if spotted. Area completion % also seems based on items rather than filling out the map and I've had bugs with map areas resetting then needing to be discovered a second time. I wouldn't go chase filling out every map square unless you really want to and even then it may be best to wait until the final collectathon.