The review said a lack of rigour and depth in inspection processes had "supported" Wilson's offences.
Among other failings and weaknesses identified by the report was a lack of supervision, poor management within the nursery, and its layout.
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A 21-gun salute was first sounded in the capital, Havana, as Castro's ashes were taken to the cemetery in eastern Cuba.
At least three children and 18 others - including members of the local police force - were among those who died.
The Foreign Secretary was unable to rule out the possibility of continuing to pay money into the EU when he spoke to Peston On Sunday.