[5] Corbett had a deep affection for the natural environment and was an honorary ranger for Egmont National Park.

[6] Corbett fell ill and, according to Wilson (1985), retired at the end of the parliamentary term on 29 October 1957,[2] or, according to his biographer, in September 1957,[4] shortly before his government's defeat.

[4] In April 2010 it was alleged by Muru Walters that in 1956 Corbett told the Māori All Blacks to deliberately lose to the Springboks "for the future of rugby"; however, several other players in the team contradict Walters' accusation and state Corbett never asked them to deliberately throw the game.

[7] As Minister he promoted the Māori Purposes Act 1950, which allowed land to be leased compulsorily and sold for arrears of rates.

The popular left hand break surf access at Waikeri (Manu Bay) was among areas with rate arrears sold to Raglan County Council.