Joe Schmidt says World Rugby have confirmed to Ireland that referee Angus Gardner got three penalty calls wrong in Ireland's loss to Japan in Shizuoka on Saturday.
The Ireland coach had expressed concerns about Gardner before the game, citing his handling of the Wales-Ireland match in the Six Nations in Cardiff, and was quick to refer to the officiating in the aftermath of the Japan defeat.
While also paying tribute to Japan, Schmidt pointed to a number of "very tough" offside calls his team, indicating his players were frustrated in real time and saying "it's not too dissimilar to the last time we had this referee."
Ireland have since sought clarification on a few matters and Schmidt says they've received confirmation from the governing body that three of the four offside calls given against Ireland were "incorrect".
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However, it emerged that two of those incorrect calls came from assistant referee Jerome Garces who is officiating Ireland's third pool game against Russia on Thursday.
"We certainly learned that we're capable. In that first 20 minutes, to be 12-3 up, I think we demonstrated that. We did put ourselves on the back foot - and partly went onto the back foot.
"We were penalised for offside four times and we've now got the feedback that three of those were incorrect calls. People were asking us about our discipline.
"It's pretty hard to keep getting off the line and onto the front foot when you are getting those calls. Two of them were from an AR (assistant referee - Jerome Garces) who is going to be refereeing us on Thursday, so we know we're going to have to be on our best behaviour.
"One thing I would say about this team is that they try to go out and deliver and, generally speaking, it's unusual for us to have a higher penalty count than our opponents. So it's frustrating.
"I thought Wayne [Barnes] did a super job (in Ireland v Scotland).
"I know that talking to Gregor, they (Scotland) were happy with how Wayne went in the first game as well. That's our fault if we were on the wrong side of the penalty count there but I do think we've got to try to look after that as best we can."
The Ireland coach reiterated his praise for the Japanese effort after coming back from an early deficit.
"We've got to make sure that we don't become passive in a game to an opposition that are playing in front of their home crowd. You'd have to be really impressed with the way Japan got themselves back into the game.
"If it wasn't us that lost the game, I'd say, 'Wow, that's fantastic for the tournament.' Everywhere we've gone, the Japanese people have been incredibly excited about the game.
"They're delighted with us, obviously, and I think loads of interest has been spiked by that."
Follow Ireland v Russia on Thursday (kick-off 11.15am) via the live blog on RTÉ.ie/Sport and the News Now App, watch live on RTÉ2 from 8am or listen to live match commentary on RTÉ Radio 1.