The Newcastle boss admitted that there was "no doubt" that his side had conceded late on in Monday's game at Goodison Park and led calls for goal-line technology
The 51-year-old was serving a touchline ban during the game but revealed his pitchside analyst had told him the whole ball had crossed the line, despite referee Mike Jones dismissing appeals at the time.
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And the Englishman acknowledged the decision would have significantly changed the game before underlining his desire for goal-line technology to be introduced.
"My analyst said to me it was over the line," he told reporters.
"These decisions are game-changers, there is no doubt about it and I am sure David will be very aggrieved.
"I have been saying all along that technology must come in and it has cost Everton a crucial goal."
Everton boss David Moyes was also critical of the officials following the game at Goodison Park, after seeing a Marouane Fellaini effort incorrectly ruled out, this time for offside.