Google Analytics 50,000 sampling limit

On large sites, some users have reported discrepancies in data due to reaching the 50,000 page limit in the content report. In this case, Google Analytics will bucket the remaining pages in the "(other)" row item. Depending on which 50,000 pages are sampled at any one time, you might see small discrepancies. In addition, there is a 5,000,000 monthly pageview limit and 2,000,000 visit limit, both of which could affect these reports in the same way.

http://www.analyticsexperts.com/2009/10/google-analytics-why-is-total-number-of.html

http://code.google.com/apis/analytics/docs/concepts/gaConceptsSampling.html#reportSampling