One Extremely Confusing Scene

At the end of the third chapter of Fitzgerald's The Great Gatsby, a party is winding down and everybody has likely had too much to drink.  As Nick Carraway leaves Gatsby's house, he stumbles upon a scene outside that was rather confusing.  Someone had driven a car off the side of the road, and the wheel had come completely off.  At first a man Nick had already had an encounter with seemed to be the man who did it, as he was standing there talking nonsense about it.  As this man was questioned about the crash, he appeared to not know anything about it.  Another man climbs out of the wrecked car and acts as if he has no idea whats going on.  Once he was shown the independent wheel, "he stared at it for a moment, and then looked upward as though he suspected that it had dropped from the sky," (Fitzgerald, 55).  The man reacts calmly, almost as if he doesn't fully comprehend what has just happened.  There seems to be massive confusion among all those involved, and nobody acts extremely concerned about the car.  The significance of this scene to the reader at this point is unknown.  Nick Carraway showed nearly no desire to get to the bottom of the incident.  Personally I am very eager to gather any further details over this random scene.