The wild car journey is split into two parts, apparently a reel is in the wrong order.
Deborah cuts Joanna dead before she learns about Joanna going out to dinner with Doctor Golfrey, apparently a reel is in the wrong order.
When the car is stationary at the start of the driving test, the background behind Juliet Mills is still but behind Deryck Guyler it is rocking from side to side.
When Joanna presses her car's starter button the starter motor turns but the engine doesn't fire. Henry tells her she has forgotten to switch on the ignition. When she makes a second attempt, Henry shouts at her that the car is in gear. If it had been in gear, the car would have lurched the first time the starter was pressed, irrespective of the ignition being off.
The front near-side indicator of the driving school car is not working properly when Joanna pulls up at the end of her lesson. It is flashing rapidly, almost certainly because the matching rear bulb has blown.