When John Ausonius is in South Africa he travels in a right-hand drive cab - but when he steps out and pays, the driver suddenly sits on the left side.
While in South Africa, John Ausonius rides in a taxi with license plates that end in "GP", meaning "Gauteng Province". Gauteng was actually formed several years after Ausonius visited South Africa. An actual taxi from that era probably would have had license plates ending in "T", for "Transvaal".