When we first see the lads in the car park, you can see one of the Tropicana Free Parking vouchers on the wall of the office (near the lightswitch). It's not till later on that they actually make the vouchers.
After Gordon collects his camera from his car, the gang are removing the engine from Gordon's Jag despite the fact we see the engine has already been removed, prior to Gordon collecting his camera.
When Danny infiltrates the car-yard during the climax of the film, Vangeli lifts him through the window of the garage. Despite clearly going through the window head first with his legs going through the window last, the next shot shown is of Danny landing poised on both his feet.
When Gordon puts down the phone after speaking with Mrs. Clark, a hand comes from under his desk to put the mouthpiece back in place.
When the police begin to pull Gordon over for running a red light, they are driving along Swanston St, on the edge of Melbourne's CBD, next to Flinders St Station. However, by the time he's been pulled over, the cars are sitting next to Luna Park (an amusement park in St. Kilda) which is several kilometres away.