Display URL != Destination URL and got away with it.

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RosettaStoneSpanish.About.com

When you click on the ad, it takes you to softwarerank.net

How did he get away with that? Any time I try to put the destination and display URL different, it automatically disapproves my ad.

Is there some glitch with subdomains?

well it is very easy..
justedit your keywords & add specific url for a kw..
but it is against g terms so beware

He's using about.com on his ad copy to help quality score and then setting the real destination url at the keyword level.

Yeah, this ad will get pulled real quick-like. Check it tomorrow to see if it is still there. Plus, there is always a chance that they will suspend your account.