Oversight: If the treasure is collected in a level, and you then replay the level (for a 100% time) without collecting the treasure, the tally screen doesn’t make it obvious you missed the treasure (as it’s technically already gotten).
Another (but completely unrelated) tally screen quirk is that if you complete the dungeon minigame in Level 5 (which doesn’t unlock anything), the tally screen claims you’ve missed a postcard piece, even though there’s none to be found, and the level door doesn’t have a postcard icon (filled or not) on it.