So, a not insignificant number of my failures are due to typos. I try to be more careful, but sometimes when I’m in the flow on a batch of reviews, I goof. Here are my most common typos:
Mistyping Provided Hiragana
I sometimes mistype the hiragana from the question. It would be nice that if the hiragana in the word are missing, bounce the interface and suggest there is likely a typo. A recent example, for ”決定する” I managed to type "けっていすつ” … so the typo was not in the Kanji at all.
Close on Mobile Keyboard
Another common typo for me is fumbling “s” and “z”, so for example, accidentally typing ”かならす” instead of “かならず”. I also fumble “i” and “u” a lot. These are because they are right next to each other on the keyboard. The すーず one is particularly insidious because even if I’m looking sometimes the " is so small I miss the difference.