Forum Moderators: Robert Charlton & goodroi
Are you saying 50 non-existant URLs in a serp?
Had these pages EVER existed (you mentioned removing some)?
Are any of these alternate URLs to existing pages?
What happens when you click on them?
Either way, take a good hard look at what actually got uploaded; check your navigation (use xenu), and check for hidden links on your code (eg image links that frontpage may have macerated).