[3] He was reputed to have miscounted the distance, due to not realising the spacing of the buoys changed from 100 m to 50 m in the last 250 m of the race, and so stopped temporarily while still 100 metres from the finish.

He took part in the SA Championships and won the double sculls event with his trainee, John Eden.

[6] Mackenzie took part in an event of the Henley Royal Regatta where he was way ahead of all other rowers when he stopped rowing and tried to adjust his cap.

[7] Although favoured to win the gold medal at the 1960 Olympic Games in Rome, he fell ill before the race and had to withdraw.

[4] After refusing to return to Australia from Europe for trials for the 1962 British Empire and Commonwealth Games to be held in Perth, Mackenzie rowed for Great Britain at the 1st World Rowing Championships in Lucerne, finishing second to his great rival Vyacheslav Ivanov.