One that really bothers me is all right misspelled as alright. Television advertising is written by illiterates who don't understand that all right is the opposite of all wrong and alright doesn't exist, already.
And then there is cavalry/calvary. Not only can't people spell them correctly, they can't pronounce them correctly. They are not pronounced the same, although many don't seem to know that. It's CAV alry and CAL vary. They are not interchangeable. The Seattle Times recently printed a review of a book about a Confederate Cavalry officer, and the word Cavalry was in the title. The headline for the review identified the person as a Calvary officer. Then in the body of the story, the complete title of the book was given with Cavalry spelled correctly. Then that reviewer spoke of the Calvary unit led by the officer. A-a-a-a-a-r-g-h!
Jude
