Labor would have lost the seat of Lyons if Liberal Party candidate Jessica Whelan had not made "inflammatory" social media comments, a review of Labor's 2019 federal election says.
Ms Whelan was disendorsed by the Liberals at the May election.
The warts and all review by former South Australian Premier Jay Weatherill and former Queensland MHR Dr Craig Emerson was released on Thursday.
The 92-page review made 60 findings and 26 recommendations.
It acknowledges swings against Labor in Braddon of 4.82 per cent and Bass 5.83 per cent.
"In Lyons, the Liberal Party was forced to disendorse its candidate following inflammatory social media comments," it said.
"There is no reason to assume a similar swing would not have delivered a Liberal victory in Lyons had this controversy not derailed the Liberal campaign.
"The swing against Labor was driven by a mix of national and local dynamics.
"The Labor-Greens agreement that underpinned the minority state Labor government in Tasmania from 2010 to 2014 remains a sore point for many voters in Northern Tasmania, who view the Greens as implacably hostile to their interests, values and livelihoods.
"For a Labor candidate in Northern Tasmania, any perception a vote for Labor could lead to more power and influence for the Greens is very damaging. "
The review says the Liberals' campaign in the North wrongly "misrepresented" Labor's support for an AFL team and support for tourism as "Hobart-centric".
"Labor's campaign did not overcome the resentment this generated in the North," it said.
The review says Pauline Hanson's One Nation Party polled well in Braddon and Queensland.
"One Nation's decision to preference the Coalition in the seats of Longman and Braddon probably cost Labor those two seats," it said.
"The vulnerability of the Liberal candidate in Braddon who had a record of cutting services in the area and the role played by an independent Craig Garland. He won more than 10 per cent of the primary vote and recommended preferences to the sitting Labor MP who, despite a three per cent fall in primary vote, enjoyed a small positive swing on a two-party preferred basis."
The review said former Greens leader and senator Dr Bob Brown's Adani mine convoy highlighted "Labor's ambiguous position on the Adani proposal and enabled the Coalition repeatedly to reaffirm its unequivocal support for the mine".