Hi,
Google Analytics will tell you the URLs that are openned on your website, not necessarily the ones that are indexed by search engines.
For example, if you use a third party module to display products in a carousel, or something in the same vein, it might not use the canonical URL of the product and your users will then uses these non canonical URLs. But that doesn't necessarily means that they are indexed by search engines, which should normally use the canonical URL in the meta data of the page, as Google do.