When Gwen is taking Jack to meet whoever is behind the contact lenses, on numerous occasions the car's rev counter is shown. However, the needle points to 0 in every shot, proving that the engine is not running whilst they're moving.
When Olivia Colasanto's plan to capture Jack fails, she states it doesn't change anything because Jack will go with her willingly. So why has she orchestrated such an elaborate and risky plan if all it took was to give Jack a message?