Newcastle manager Eddie Howe felt referee Mike Dean's decision not to stop play for an apparent head injury was the pivotal moment of the game as Liverpool equalised before going on to win 3-1.
Leading through Jonjo Shelvey's early strike, Isaac Hayden collided with Jamaal Lascelles and was on the floor in the six-yard area when Diogo Jota followed up his own header to score.
Within four minutes Mohamed Salah's 22nd of the season put Jurgen Klopp's side ahead and Trent Alexander-Arnold's long-range 87th-minute blast sealed the points.
'We didn't do everything right, that's clear, but we certainly didn't have the luck either,' said Howe, who has taken five points from his six matches in charge.