El asesino dentro de mí

The piece of music that Lou (Casey Affleck) plays on his piano is the 25th variation of J.S. Bach's Goldberg Variations. It was regarded by musicians, such as Glenn Gould and Wanda Landowska, as one of the most significant pieces of music ever written, even within the context of the entire set of variations, which is generally held to be one of Bach's greatest masterpieces. Gould's 1955 recording of this variation was included in the soundtrack to Slaughterhouse-Five (1972), during scenes portraying the firestorm that destroyed Dresden.

In the chase scene where Lou is chasing the bum through the streets to the town square, they pass a tanker truck with a modern cab.

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