Early in 2008, Johnson lost his drivers' license and was sentenced to 50 hours working with the Transport Accident Commission after he was clocked in over 70 km/h over the speed limit in a 50 zone. Teammate Shannon Byrnes was in the car at the time. He had yet another stellar season on-field in 2008, kicking 49 home-and-away season goals and earning a spot on the forward flank in the All-Australian team of 2008. He gathered 34 disposals in the Cats' Grand Final loss to Hawthorn.