Forum Moderators: Robert Charlton & goodroi
The old URLs may hang around as "Supplemental Results" for a long time - that should not be an issue to worry about. See this thread for lots more:
Supplemental Results - what exactly are they? [webmasterworld.com]
Links to any of those pages no longer count, which was the real point of getting an answer to the question.
You'll also want to get external links to internal pages of your site.