Corrected entry: At the start, when Michael's looking at the horses, we see his car behind him on the road, with the exhaust visible. Exhaust's only visible when the engine's cold (ie. if the car was started just before the cameras rolled) - he's been driving for a while, so nothing should be seen.
Jon Sandys
1st Oct 2007
Correction: Completely untrue. A car's exhaust will be seen whether the engine is cold or warm, if the air temperature is humid and cool to cold. Around freezing exhaust will be constantly seen, and even a little above freezing temperatures, exhaust will be seen if the humidity is right. It's got nothing to do with the engine being cold or not.