The film was based on work by the Pat Finucane Centre, Justice for the Forgotten and Anne Cadwallader's book Lethal Allies.

[5][6] One of the most notable claims in the film is that the UVF considered carrying out a massacre at a Catholic parochial school in Belleeks in retaliation for the 1976 Kingsmill massacre; supposedly, the idea for the attack came from British military intelligence, who wanted violence in Northern Ireland to "spiral out of control" in order to justify a severe military response, a "short and sharp process of cleansing out the IRA.

"[12] Charles Flanagan, a Fine Gael TD and former Republic of Ireland Minister for Justice and Equality, attacked the film, saying that he "did not believe the documentary was objective, fair minded and balanced and questioned if RTE bosses were aware of how it was funded.

[…] the late Justice Barron who carried out four investigations in the early 2000s on behalf of the [Republic of Ireland] Government found that John Weir’s testimony was credible – as did the Gardaí.

[18] In the blog post, O'Doherty highlighted that Murray had not warned viewers that one of his central researchers and commentators, Paul O'Connor, had hidden his IRA past for decades while posing as a Human Rights activist and Director of the Pat Finucane Centre.

O'Doherty pointed out several other factual errors in Unquiet Graves, rendering a final opinion that Unquiet Graves could justifiably be seen as IRA propaganda in light of the evidence contained in his blog post considered alongside Murray's extreme political views and his failure to record details of the IRA's 800 murders during the period covered by his documentary.