One of the advantages of print newspapers is accountability. Print newspapers can be (and generally are) archived by public libraries. My local library has archives of local papers going back decades. When corrections to previously published articles become necessary, the corrections are published in such a way that both the original article and the correction are archived.
Of course there are projects that seek to archive online newspapers too (archive.org is awesome!), but online newspapers are able to thwart archiving either through technical means or policy (robots.txt.) Furthermore even when they aren't maliciously attacking archival efforts, online publications can swap out headlines or even the full content of articles, sometimes before the original has been archived. That sort of undisclosed on-the-fly revision simply isn't possible with print newspapers.
Of course there are projects that seek to archive online newspapers too (archive.org is awesome!), but online newspapers are able to thwart archiving either through technical means or policy (robots.txt.) Furthermore even when they aren't maliciously attacking archival efforts, online publications can swap out headlines or even the full content of articles, sometimes before the original has been archived. That sort of undisclosed on-the-fly revision simply isn't possible with print newspapers.