Yes, of course. When the red swiggle first began to manifest, I remember noticing quite a few words that I had been spelling in a specific way, often informed more or less by orthography and etymology, but still incorrectly. For those who struggled with a lot of words, their misspellings could be nearly as distinctive as their handwriting.

I think "paradice" is likely an intentional mistake on the Zodiac's part, though. His apparent level of education doesn't fit with him being unfamiliar with that word.