When exporting data as NTriples, quotes in strings are not quoted correctly. Example: https://www.wikidata.org/wiki/Special:EntityData/Q33742.nt?flavor=dump produces this string:
<http://www.wikidata.org/entity/Q33742> <http://schema.org/description> "language naturally spoken by humans, as opposed to \\"formal\\" or \\"built\\" languages"@en .
Note how the slash is doubled. It is not correct - it should be single slash. TTL format works fine.