Have you ever seen "Other" in your Top Content report and been confused about what that actually is? I've been looking at that for a number of months now, and I finally stumbled upon something official from Google about what it is.
It turns out that if you have more than 50,000 unique URLs on a given day, then the top content report will lump any of the excess under "other". So, all your pageviews are always counted but the drilldown capability gets limited after 50,000 unique URLs.
This article has the details about what it is and how to work with the limitation: