During the flashback to David's crime, after the police officer has pulled over the man and his daughter and starts to leave, you can hear their car engine start before they could have finished switching seats.
During Matt's flashback scene, his accomplice tunes car's AM/FM radio and starts listening to Wu-Tang Clan's "Wu-Tang Clan Ain't Nuthing ta Fuck Wit." This song would not be able to be played on terrestrial radio in the US due to FCC obscenity rules.
During Tilly's flashback to August 14 , 1993 Toad the Wet Sprocket's "Fall Down" is playing. Dulcinea was not released until May 24, 1994.
During the flashback to Richard's crime, shown as December 3, 1997, The Rockafeller Skank is playing on the radio. That song was not released until October 19, 1998.