After almost two hours of goalless action ITV cut to a break and viewers missed the extra time goal by Everton 19-year-old Dan Gosling.
When producers returned to the action the scene showed Everton players celebrating the vital winning goal, which put Liverpool out of the FA Cup.
Afterwards ITV1's studio anchor Steve Rider apologised saying: "The goal came at the worst possible time for us as we were having some technical problems."
His apology was followed by a statement at 11.30pm when a spokesman for the broadcaster said: "ITV experienced some technical problems which would appear to be an issue with network transmission. We apologise for any interruption to the game."
A large number of fans have already expressed their fury about missing the action on internet message boards.
One member of ITV's sports forum said: "ITV must be aware that many are cynical about the FA Cup being on ITV because it is a commercial station, so this really rubs it in your face, mistake or otherwise. Unbelievable."
It is not the first time ITV has had to make apologies for its sports coverage. During its coverage of the San Marino Grand Prix in 2005 the final ad break, lasting two minutes 30 seconds, came just as the closely fought race between Fernando Alonso and Michael Schumacher was entering its closing stage and finished just before the final lap.
It led to 126 complaints to Ofcom, all of which were upheld.
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