I noticed the flagman on the track, I knew it was a tradition. Normally the race is over by the last lap and cars line up for the checker flag photo but one car was still racing today.
I watched a lot of the race and learned some history. I recall they used to start the race with the drivers running across the track, get in their cars, start their cars, and take off in a chaotic start. One of the commentators pointed out that one driver chose to take his time walking to his car, he went on to win the race (don't remember the name of the driver) - he showed how silly that tradition was (some drivers wouldn't properly buckle up and it also became a safety issue).