Attempting to import a title that came out as an interwiki would sort of half-work...

Attempting to import a title that came out as an interwiki would sort of half-work somewhere then explode when trying to save the null revision with the import info:
Fatal error:  Call to a member function insertOn() on a non-object in /Library/WebServer/Documents/trunk/includes/specials/SpecialImport.php on line 305

Now such titles are skipped. You can probably force import of the page by forcing the target namespace...

Better long-term solution might include title renormalization, adapation of remote namespace names (eg Wikipedia -> Project), etc.