The 2016 Electoral College vote had the most faithless electors since the 19th Century, and was the first in 100 years to have more than one. From Wiki-Pooh:

In the 2016 United States presidential election, ten members of the Electoral College voted or attempted to vote for a candidate different from the ones to whom they were pledged. Three of these votes were invalidated under the faithless elector laws of their respective states, and the elector either subsequently voted for the pledged candidate or was replaced by someone who did...

As a result of the seven successfully cast faithless votes, the Democratic Party nominee, Hillary Clinton, lost five of her pledged electors while the Republican Party nominee and then president-elect, Donald Trump, lost two. Three of the faithless electors voted for Colin Powell while John Kasich, Ron Paul, Bernie Sanders, and Faith Spotted Eagle each received one vote. The defections fell well short of the number needed to change the result of the election; only two of the seven defected from the winner, whereas 37 were needed to defect in order to force a contingent election in Congress (a tally of less than 270).

I think it's hilarious that with all the Sturm und Drang about Trump, it was the odious Hillary who had more faithless electors. Nelson Muntz says "Ha Ha!"