I think you are splitting hairs here.
Took me a while to realize I was staring at "i's" for a certain word. Makes everything harder to read anyway.
But maybe that was exactly the point?
But I can think of better ways to make a quiz more difficult. (it is like using very light yellow on a white background, it doesnt make the quiz itself harder, but it does make it harder to take it. Rather have a higher difficulty
The th and double ll (for skull) and other things in the english language that arent written as they sound (extra letters) do make it harder, but that is the fun bit. :)