This is to collect the places where rules which could get easily forgotten about, but might be very important.
My two:
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You can only Unmask at the start of your turn and at the end of your turn.
Core Rules, pg 30, in the Timing of Being Compromised and Unmasking sidebar
This means that if you become Compromised when it is not your turn (due to something giving you Strife through Opportunities, or through the Ikoma Bard school ability), you cannot Unmask until your turn. This is especially relevant in a Duel, where becoming Compromised can trigger a Finishing Blow, which if it lands, you cannot keep dice with Strife icons for your Fitness roll to reduce the critical strike's severity. -
When you spend XP, you must choose if you are applying this spent XP to your School's Curriculum or your Title's Curriculum.
Core Rules, pg 305, second paragraph under Titles
Spending XP to advance your Title does not count for XP spent advancing your School Rank, and vice versa. If a Title Curriculum includes the appropriate symbol, it will grant access to certain Techniques that a character would not otherwise have access to, but it is unclear if this access remains after the Title has been complete.