Grid behind this lambo, followed him 6 laps finally a faster car caught us and I sped up and got a point by, he held me back by 3 seconds a lap but I did not mind chasing him, this track is hard on tires so I conserved a bit catching him in the corners.

when the cobra came by it looked fun to follow so I pressed and got a point

 

Looks like that was a lot of fun!

What are the red circle/white background signs intended to mark? If it was the apex, a lot of them looked like very "late" apexes to me.

 

apex markers, the corners are all constant radius so they just put them at the center point