Are you kidding? We could be here for days! LOL!
Okay, here's what I've noticed. Raven actually has a fairly normal vocabulary and is very proficient in spelling most, if not all, of the bigger words that he uses. He actually seems to have trouble with the smaller ones, especially those that sound like other words but are spelled differently.
Also, SES, you are right. He does once in a while mix up capitals and lower cases, mostly the first letter of a word in the Middle of a sentence, <<< that's just an example, btw.
He seems to have trouble with proper apostrophe use. (Not that I should talk because my use of commas is embarassing!)
With all of that in mind, here are some words that I've found on the Online Activity thread. These are words that seem to me to be obvious misspellings, and not just typos:
Apostrophes
Shed's (instead of sheds) - "shed's light on ..."
Pro's (instead of pros).
Bikes (instead of bike's) - "... the bikes got low mileage"
Thats (instead of that's)
Misspellings
Preasure (instead of pressure)
Wrap (instead of rap) - "bad wrap"
Narly (instead of gnarly)
Gasget (instead of gasket) - "the gasget cracked"
Reving (instead of revving)
Spudders (instead of sputters) - "it spudders a little bit"
Grammar
Fast (instead of quickly) - "I can learn fast."
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I must say here that I make my own share of mistakes in spelling and grammar so I'm not poking fun at Raven. I do agree that these mistakes might help to identify his posts on other boards.