#3 Wierd unusual crash after Chequered Flag
Starting 20th and finishing fourth was a huge recovery for Sebastian Vettel and Ferrari, given their disastrous Qualifying session. However, they were forced to face another problem and weirdly, it was after the Chequered Flag had been waived.
Vettel on his in-lap was just picking up some rubber by taking the outside line at Turn 5. In the process, he going past a strolling Williams in Lance Stroll. The latter probably didn't see Vettel and collided into the back of the Ferrari, ripping away it's rear suspension.
It was no particular driver's fault and such incidents rarely happen. Thus, the stewards too ruled that no further action would be taken. However, going by the damage on the Ferrari, they could be forced to use a new gearbox which would mean a five-place grid penalty.