#2 Second half substitutions helped the visitors regain their spark
Liverpool lacked innovation and ideas in the final third of the pitch early on, and the prospect of defeat seemed very real for vast stretches of the match. In order to restore parity, Jurgen Klopp made a few changes in the second half - and that saw a massive change in the way Liverpool attacked.
Adam Lallana, Alex Oxlade-Chamberlain and Naby Keita came on in place of Divock Origi, Jordan Henderson and Gini Wijnaldum respectively. And the trio linked up pretty well to ensure their side did not leave Old Trafford empty-handed.
The 83rd minute saw Chamberlain, Firmino, Fabinho and Robertson combine to break a resolute United defence, after which Lallana ghosted his way past Ashley Young to score from close range. After getting the equaliser, Liverpool forced United to defend in their own half and created few more chances to scare the hosts.
Oxlade-Chamberlain linked up with Firmino and found himself with some free space in which he drifted and launched a shot that whizzed past De Gea's left hand side. The Reds had another chance to score from the corner, but the cross was well intercepted before Fabinho had could line up for a free header.
Liverpool left it late in the second half to create a few meaningful opportunities, but they would be thankful that the second half reinforcements at least helped them get the equalizer.