It was an unfortunate game for Liverpool, which can cost them the title.
They dominated in ball possession (63%) and were much more aggressive in attacking, which is not hard given this is the area Man United struggles the most. Liverpool had 28 shots on goal compared to only 9 by Man Utd.
Perhaps the lack of danger caused Liverpool's defense to get overly relaxed, causing an embarrassing mistake and effectively giving the goal away on a silver platter to Fernandes.
It's good for entertainment though. With 7 rounds to go, we still have 3 teams at the top with almost the same number of points. I think Man City has potentially the easiest games, so, in my opinion, they're most likely to defend the title.