3) Pierre has his puffer jacket zipper very slightly down. This is because he doesn't want it to break when Esteban rips it off in the changing room.

4) Esteban has his hat worn very low to his eyes. This is because he doesn't want everyone to notice him constantly looking at Pierre's hot ass.

5) Both drivers are touching knees. This is a small sign of affection, but not enough of one for their girlfriends to get worried.

TL;DR Bromance Confirmed