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You can drill down to a class type and see items and some basic migration info. This is a good place to check for migration errors to work on.
Clicking on the an item , brings up a detailed view of any datastreams that are attached to the item.
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You can look at the datastreams (including any images) below the header under Fedora 3 or Fedora 4.
Not everything created in Fedora 4 for a migrated MediaObject will show in this report, such as access control and list_source objects (ordering via proxies).
Some migrated items won't have fedora datastreams attached to them. There are some items that are migrated straight from the database. For now they have limited details pages. After you run the avalon:migrate:db rake task, the db items will also show up in your migration report.