Tae-goo is revealed to be wearing hidden body armor after surviving the final showdown.
Tae-goo reaches down to pick up his hat whilst Chang-yi repeatedly shoots it away
The concept of the three main characters as well as the title come from this Sergio Leone classic.
The shot composition of the final showdown echoes the famous movie poster image and the 'whistling finger' and flashback recalls Harmonica.
The protagonist Tae-goo is driving shown a motorcycle in the middle of a desert, and has his front wheel shot from afar, causing him to halt his journey, much to his dismay
Tae-goo is dragged behind a military vehicle during the chase in the desert
The safe in the movie is a fictional brand (Franz Jäger) that is previously repeatedly occurring in the Swedish comedy films "Jönsonligan"
Chang-yi (The Bad) is watching 'It Happened One Night' in the movie theatre.