[1] He held office from May 1967 until July 1975 during the military administration of General Yakubu Gowon.

[4] When appointed Military Governor of Rivers State in 1967, he was a Naval Lieutenant Commander aged 25.

[5] In 1973, a correspondent for the Nigerian Observer wrote an article about an impending teacher's strike, which was published on Diete-Spiff's birthday.

Taking this as a deliberate insult, Diete-Spiff's aide Ralph Iwowari had the reporter's head publicly shaved and had him beaten with 24 lashes of a cane.

[8] In October 2022, a Nigerian national honour of Commander of the Order of the Federal Republic (CFR) was conferred on him by President Muhammadu Buhari.