I still am dismayed that so many people insist on pronouncing dissection as disection (no such word), confusing it, I'm sure, with bisection. After all it's dissent, not disent. And ii's dessert not desert if you're talking about food.
Many of us including myself struggle with the metastasis of certain words, the rearrangement of letters in words. Libary for Library or foilage for foliage--which I'm especially prone to do. Another common one is purdy for pretty, although I think purty sounds nice.