errors during database upgrade

I needed to upgrade a WP 2.1.2 implementation to WP 2.9.1

With WP 2.1.2, an automatic upgrade was not possible.

So I used the manual approach, i.e. turn off the plugins, delete everything but wp-content, wp-config.php, etc. and then uploaded the new WP 2.9.1 files and directories.

I then navigated to the mydomain.com/wp-admin directory which triggered the upgrade sequence. I got a screen saying that the database would need to be upgrade and clicked to start that process.

But during the database upgrade, a number of errors scrolled by indicating that certain records were not being upgraded… But at the the end, I did get a message saying that the db upgrade had succeeded.

When I checked the upgraded site, most things are working, but a number of pages and posts are missing. I assume the missing pages and posts are the ones that triggered the errors.

I have a number of questions:

1. Is there any log of upgrade results and errors stored anywhere. And if so, how do I access it.
2. Is there anyway to recover the missing records, fix them, and get them back into the upgraded database.
3. What causes some records to trigger errors and get rejected.

I do have everything backed up but I don’t really want to revert to WP 2.1.2 Particularly if I don’t know how to fix the problematic posts and pages.

TIA

–Doug