1. The release of the letter by Comey to the republicans in Congress 11 days before the election, and the media saying that the "email investigation had been reopened", which was a LIE, and parading every republican across the TV screens propagating that LIE.
2. Russia interference in our election through hacking, influencing certain groups through social media, and other avenues, with outright lies that were pushed not only by opposing campaigns, but also exploited by elements of the media, along with the false equivalency narrative.
A few days after Comey released the letter to the republicans in Congress, Bret Baier from fox news reported from his sources in the FBI, he was told that an indictment against the Clinton Foundation was imminent. That was a LIE, but for the next several days other media outlets propagated that lie. Baier finally came out and apologized on air, saying that the information he was given was incorrect, and he should not have said anything. Of course by that time the damage had already been done with Comey and the media's irresponsible coverage of those events.
What happened isn't rocket science, and most of the "post-mortem" spewed to the public from the media, and media pundits, was the media's attempt to white wash their involvement, and unethical and shoddy behavior in their reporting.
This shoddy reporting was occurring throughout 2016.
Perhaps the most outrageous example was Matt Lauer's interview with Hillary and Trump, and how he kept interrupting Hillary before she could finish a question. The double standard was so apparent.
The indictment demonstrates that their was Russian interference at the highest levels in our election. There are a lot of journalists who should be hanging their head in shame, among them, Glenn Greenwald and Matt Tabai.