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Also if I put a NOINDEX tag on the pages will they be dropped during the next update?
This could be because there wasn't enough time left in the crawl cycle, the server was down when the bot came, or because the robots.txt forbid crawling those pages.
Sounds like the latter may be the case for you.
OTOH, I don't see why you would have used Add URL to submit a page that you didn't want indexed. Is there valuable content on these pages that someone else might have felt was worth linking to directly, thereby bypassing the form? I ran a site once where we wanted users to register before viewing certain content. Ultimately, though, the information showed up in Google's index.
There have been other reports in this forum in the past saying that Google had indexed pages that the owner had not meant to be public. There is speculation that it might be able to get pages from toolbar requests.
If that's what happens, and you really want people to register before viewing the page, you will have to implement some logic (perhaps something that looks at the referer to determine it's not a search engine) to force them to the registration page. Of course there are ways around this, too.