Spoiler alert

1. The odd hairstyle of Dae-su is the first pull of the film
2. 'Shall we visit the grave tomorrow?'
3. Hallway fight scene and the line 'All those who are blood type AB, raise your hand'
4. If the reason for revenge is Dea-su betraying Woo-jin's sister, it would have been cliche.
5. Woo-jin's laughter when Dea-su licks his shoe
6. Dea-su is made to hear the intercourse, thus uncompromisingly squeezing out the last bit of revenge