But these things are creeping into native speakers' use also. They are:
1) Confusing the words 'lose' and 'loose.' Lose is the word you use when you mean the opposite of 'find.' It is also used to mean the opposite of 'win.' Loose is something that is the opposite of 'tight.' There is no 'loosing,' (EDIT: a1k0n corrects me here, see his comment below) there is 'loosening,' however, as in what you do to your belt after a large meal. OP makes this error.
2) Using apostrophes for plural. Apostrophes are used to show (a) possession and (b) contraction (leaving letters out of a word). Writing "I'm buying two car's" is incorrect. Replacing your car's winshield wiper blades is ok. So is leaving out the car entirely when drawing a 'toon.