Everyone watching the game were left stunned after a James Frawley shot at goal was given the all clear and deemed untouched despite replays showing Rory Thompson get a fist on the ball.
AFL football operations manager Mark Evans conceded the decision was a mistake.
"I've reviewed that this morning with our umpiring department and we felt that there was enough of a deflection seen on one of the bits of vision in the score review system that it should have been called touched," Evans told the AFL website.
"We felt that that was an error and it should have been called as touched and then changed the goal umpire's call.
"It's an error under the time pressures of running the system. It's just a simple error."
Evans said the AFL plan to introduce goal-line cameras later this season, although he couldn't confirm a specific date.
"We do think goal-line cameras will help us produce a better result and we're still hopeful that we can get the MCG and Etihad on board for the second half of this season," Evans said.
"The solution isn't easy and we should absolutely be telling people that even when these cameras are in there will be other things that the system doesn't pick up."