As reported by many leading blogs, Google Instant Previews was causing reporting errors in Google Analytics. Several users had reported this issue in Google’s Help forum. Finally, Analytics team has now posted updates regarding this issue, and the problem has been solved out.
Analytics team explains, "Since Instant Preview launched in early November, some Analytics users have noticed increased page views in their accounts. We’ve now fixed this issue, and visits from Google Instant Preview will no longer show up in your Analytics account. We will not be reprocessing the data to remove past visits, but you can use an advanced segment to see the visits from Instant Preview in the context of your total traffic."
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To hide Instant Previews on Google SERP, install this greasemonkey script created by Arpit.