Eagle-eyed fans spotted what Virgil van Dijk did to James Tarkowski after the Everton defender avoided a red card for a 'reckless' foul on Alexis Mac Allister.
Tarkowski contacted with the leg of Mac Allister in his follow-through after he slid in to win the ball in the first half.
He was shown a yellow card on the pitch by referee Samuel Barrott, with VAR official Paul Tierney then deciding not to recommend a change of decision to a red card.
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The Everton defender has now equalled a Premier League record, along with Oriol Romeu, for the most yellow cards without a red card in Premier League history (63).
The Premier League Match Centre confirmed that the tackle was 'reckless' but met the threshold for a booking rather than a sending off.
But unlike in the 2-2 draw at Goodison Park in February, Tarkowski couldn't inspire Everton to a result on this occasion at Anfield.
Diogo Jota scored the only goal of the game in the second half to secure a 1-0 win for Liverpool, who move 12 points clear of second-placed Arsenal at the top of the Premier League table.
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And Van Dijk also got 'revenge' for Tarkowski's tackle on Mac Allister.
During the second half, the pair had an off-the-ball altercation in the penalty area, with the Liverpool captain shoving his opposite number to the turf.
Tarkowski quickly shrugged the incident off, though, and got back to his feet.
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He would later approach Mac Allister at full-time to seemingly discuss the tackle, though it wasn't clear what either man said.
Speaking to Sky Sports after the match, Everton manager David Moyes said of the incident: "My first thought was that it was a brilliant tackle for a derby game.
"It was a tackle that maybe we would have seen a few years ago, but I understand it nowadays that things are slightly different, with follows through et cetera.
"Yeah, we might have got a bit lucky."
Topics: Virgil Van Dijk, Liverpool, Everton, Premier League
Ryan Smart