Here's a brief 6,000-word summary of just the early media errors on Russiagate: https://taibbi.substack.com/p/russiagate-is-wmd-times-a-million

Here's a summary of the errors and deceptions involving the FISA warrants, which resulted in public reporting that Carter Page was an "agent" of a foreign power (he was not) https://www.rollingstone.com/politics/political-commentary/horowitz-report-steele-dossier-collusion-news-media-924944/ That case also resulted in nearly a year of stories claiming Devin Nunes had lied in his memo on FISA abuse -- he did not

Intelligence sources who said Trump was guilty of "treason," or had been in "constant contact" with Russian intelligence, were spectacularly wrong. So was Adam Schiff when he said there was "more than circumstantial" evidence of collusion. We were lied to repeatedly about the Steele dossier. I could go on.

I say all of this as someone who dislikes Donald Trump intensely.