1) When you do a full pitstop, and refuel to the brim, only one tyre man stands up after he changes the tyre. The rest still squats with one arm raised up.
2) When you select to refuel only, they car still get jacks up, although no tyres were changed.
3) They never show the tyre changing process of the Jag Silk Racing car. Why? I don't know, maybe because the rear wheels are covered?
4) When you make a mistake and lock up, no matter if your in a 100 hp car or a 1000 hp car, the amount of smoke resulted by the lock up will be the same.
5) In the open cockpit cars, at the start, for some reason, the driver's head never looks straight. He's always looking towards his left.
6) When you take a trip to the kitty litter, the same amount of dust/sand gets kicked up, no matter what speed you go. And, they never seem to spill over on the track.
7) The Nissan GTR Racing Version (not sure of the model, but it's a basically GT version of the R35) always bottoms out at every part of the track, resulting in massive sparks flying. Not even the F1 car bottoms out that much.
8) Although, there's no overtaking in rolling starts before the star/finish line, in some circuits, you tend to overtake the 5th guy even before the race starts.
9) Only at the end of the Mulsanne straight, the front disc tends to glow under braking.
10) The cars mysteriously don't lock and spin out when you gear down too fast before the corner approaches. Instead, the engine just revs higher...