Geelong coach Chris Scott has intimated he has "inside information" that the AFL's goal-line technology isn't up to scratch after Oliver Dempsey was controversially denied a goal.

Cats wingman Dempsey thought he had poked home a goal during the second quarter of his side's 20.7 (127) to 16.17 (113) win over the Western Bulldogs on Thursday night.

But the goal umpire's decision was overturned on review due to a slight spike on the 'Edge' technology, which indicated the ball had nicked the post on the way through.

"This is controversial, probably, but I'd love to see the technology around the Edge with that shot at goal," Scott said.

"The goal umpire was 30 centimetres away from that.

"If he can't hear that or see that, then something's wrong. Like, the technology, please."

Scott did not want to comment on a Dempsey mark that appeared to be taken over the boundary line at a crucial stage of the final quarter.

The call to pay the mark left Bulldogs players stunned and led to an important goal for the Cats.

Scott said he did not have a good view of that incident, but went back a second time to Dempsey's overturned goal and challenged the AFL.

"I am prepared to say with the Edge technology, show us that it works," the two-time premiership coach said.

"They're saying it works off sound but the goal umpire's 30 centimetres away from it.

"If he doesn't think that it hit the post - I back him over the technology any day.

"And I might have a bit of inside information that it doesn't work that well."

The decision to pay Dempsey's fourth-quarter mark raised the ire of Bulldogs coach Beveridge, whose side was also on the wrong end of a 26-12 free kick count.

"Critical part of the game, lots of eyes on it, but as I always say, swings and roundabouts, they happen," Beveridge said.

"No one's sitting in our rooms thinking about the free kick differential and no one's talking about it. It just happens here and there."