I realise this thread is old, but Media Matters has an astonishing roundup of the year in Fox apologies:

Fox News’ year in apologies: fake videos, false info, cutting and pasting from GOP.

There’s no way this latest mistake was accidental:

Stewart blasts Hannity for using old video footage to inflate Bachmann rally attendance
Fox News’ Garrett apologizes for fake HBO-Obama story — which Fox News repeated days later.
Kilmeade: Americans don’t have “pure genes” like Swedes because “we keep marrying other species and other ethnics.”
Labelling Sanford a Democrat
Fox News presents deceptively cropped 6-month-old Biden clip as new
Fox News Watch’s Scott claims “[w]e don’t have any idea” what Biden said to AFL-CIO, but transcript was available.

This is the most damning, to my mind:

Fox passes off GOP press release as its own research — typo and all. During the February 10 edition of Happening Now, Scott purported to “take a look back” at how the economic recovery plan “grew, and grew, and grew.” In doing so, Scott referenced seven dates, as on-screen graphics cited various news sources from those time periods — all of which came directly from a Senate Republican Communications Center press release. A Fox News on-screen graphic even reproduced a typo contained in the Republican press release.

The following day, Scott apologized — for running the typo. Scott’s apology was criticized by Washington Post media critic and CNN host Howard Kurtz, who said: “We sometimes jab at the pundits for using talking points, but in the case of Fox News anchor Jon Scott, it was literally true this week. … You should be apologizing for using partisan propaganda from the GOP without telling your viewers where it came from. Talk about missing the point.”