Monrak Transistor:
Around the 70-minute mark, you can hear "Parting Comrades", a music piece that was used in the season 1 and season 2 finales of Farscape.
The Myth:
During the "general's last stand", the music is obviously borrowed from the Requiem for a Dream theme.
A Chinese Odyssey 2002:
The music that plays during Tony Leung's last charge comes from A Chinese Odyssey.
And the music from A Chinese Odyssey comes from Ashes of Time.
From Beijing with Love:
The first scene in which we see Stephen Chow features a track from Days of Being Wild.
She's on Duty (korean comedy):
The music that plays during the first two fights comes from Lord of the Dance.
Kung-Fu Hustle:
The traditional chinese music that plays when The Beast stops the bullet has already been used by Stephen Chow in Royal Tramp.
A World without Thieves:
The french song at the beginning of the movie is Edith Piaf's La Vie en Rose. It can be heard in several american films.
Great Yokai War:
When the kid is fighting Chiaki Kuriyama in the Goblin's cave, there is a cue from Bichunmoo.
What else have you noticed ?



