You export the pages your crawler found and the pages your analytics recorded, compare them, and get a difference of two hundred URLs. Before investigating any of them, check whether you are comparing like with like.
The most common false positive
One system records /pricing and the other records /pricing/. As strings these do not match, so every affected page appears in the difference — reported as a crawlable page with no traffic, or traffic to a page the crawler never found. Both readings are wrong.
Normalise first, then compare
Put both lists through the same trailing-slash rule before comparing them. The differences that survive are real ones worth investigating, and there are usually far fewer than the raw comparison suggested.
The time this actually saves
The cost of skipping this is not the five minutes of normalising. It is the afternoon spent investigating two hundred phantom orphan pages, and the credibility lost when the finding turns out to be a formatting artefact.
Try it: Add Trailing Slash to URLs on SeoWolf's Notepad.