The ring tones of the character's mobile phones are songs from dEUS (Director of the movie is Tom Barman, front man of dEUS).
After the street chase scene around 35' there's a cut back into Walters apartment. The front record on the table is Heute by Zwischenfall. On the floor he digs through The Future 12" by Stratus and Things Have Got To Change by Archie Shepp.