The one that gets me (besides the theres & wheres and its) is faze and phase.
"It didn't phase Lois that Clark was Superman."
That curls my toes. It makes me want to take my
phaser and stun the author. The correct word is
faze.
faze=disturb, worry, bother
phase = changing states or stages of a thing. "The phases of the moon." Not "the fazes of the moon."
As to dessert and desert. I live in a desert and I like to eat dessert. I'm glad they're pronounced differently, or I would be really confused.
Artemis