When the family on holiday driving the second yellow mini arrives at the tea room the mini has a boot lid and a roof rack with luggage on it, when the police car pulls up behind it the boot lid and roof rack are missing.
The driver license of Leslie Morris states her address is 63 Bassett Street, Remuera. Later in the film when Gerry tells John and Shirl about the license, he says her address is 25 Dennis Court Road, Remuera.
At Wellington Station, the Mini is stowed into a wagon numbered ZA651. Later on in the South Island, the wagon is numbered ZA2234.
The mini's battery is removed but the headlights still work.
When the family on holiday driving the second yellow mini arrives at the tea room the mini has a boot lid on it, when the police car pulls up behind it the boot lid is missing.
When Gerry and John are returning to the train in Christchurch at 8:45pm, twilight can be seen in the background. Being late September, twilight would have been well over by 8:00pm.
According to the radio, Shirl was arrested after walking out of a chemist shop without paying for her developed photographs. The camera she used in the train was a Polaroid - no development would be needed.
In Invercargill, Sue is listening to 4XO on the radio. 4XO was a radio station based 200km away in Dunedin, and could not be picked up in Invercargill.
In the scene in the train, as they approach Kaikoura, John makes mention of watching out for UFO's. This is a reference to the Kaikoura UFO incident, but this occurred in December, 1978, not September, so although the event was well known by the time of filming, it could not have been known about two and a half months beforehand.
The police car in the Wellington railway yards has a "carless day" sticker and a "carless day exemption" sticker on its windscreen. The carless day scheme was not introduced until July 1979.
The two rail locomotive featured in the film, number 1664 and number 1582, were not operation in spring 1978. Locomotive 1664 only arrived from the manufacturer in 1979, and 1582 was known as 1536 before September 1979.
The combine harvester that causes the 'big Aussie tank' to run off the road is hundreds of miles from the nearest corn fields, and six months away from harvest time.
When the Family in the Yellow Mini wait at the Railway crossing south of Picton for the Train to pass, an XD Ford Falcon is seen on one of the wagons. The XD was not released until 1979.
Meeting Snout, a direction sign in the background points Dunedin left and Palmerston right. With Gerry and John travelling eastward from Cromwell, the sign should say Palmerston left, Dunedin right.
We don't see how they get the Mini back off the train.
Leslie Morris's license states she is a 33-year old female. It is unclear how 19-year-old male Gerry could have successfully used the license to obtain a rental car.
Sitting in a lounge aboard the Aratika inter-island ferry, Gerry says he read a poem downstairs on the toilet wall. The Aratika had all three of its lounges on the lower passenger (A) deck - downstairs would be the vehicle deck, which doesn't have toilets.