- The designers put the Intolerance set in the game, which was demolished in 1919. Although this was admittedly intentional, as the creators stated they put it in for a bit of cinematic fun during the conclusion of one of the cases.
- Another minor example: LA's famous palm trees would have only been at about head height in 1947. The developers intentionally made them taller because they thought it looked cooler.
- Many of the vehicles and songs in the game are from 1948 or 1949, the most notable being the 1949 Chevrolet Styleline, although next-model year vehicles are generally available for purchase partway through the current model year.
- All the cars in the game have brake lights, a feature that wasn't commercially available until 1952. Admittedly, brake lights were made for the purpose of determining which car is moving or not, so this is more of a gameplay choice.
- The jazz pieces from the game's original score are done in a style that wasn't created until the mid-50s, but they just set the mood so well.
- Also, the term "motherfucker" is used a few times. While the term actually dates back to 1918, it was not notably used until the late '50s.
- In one case, there is a letter with a ZIP Code on it. ZIP Codes were not introduced until 1963.
- In one of the Vice cases, gangster Bugsy Siegel is mentioned as if he was still alive, when in reality he was murdered on June 20, 1947, months before the Vice cases take place.
- Many of the new houses going up are built with plywood sheeting for the walls. While plywood did exist back then, it was very expensive and would rarely have been used in housing construction, simple boards being the more practical option. Production of plywood has gotten better since then, resulting in it being cheaper than boards (and thus a more common construction material) today.
- The KTI Radio announcer says that the station is on 760 kilohertz. The reciprocal second wasn't called hertz until the SI was adopted in 1960. Before that if would have been called cycles per second.
Anachronism Stew / L.A. Noire
For a game that seems to get everything else so perfect, it's kind of odd there would be so many errors. The game designers have certainly Shown Their Work, but the Rule of Cool (and maybe a few Acceptable Breaks from Reality) made for a few cases of A Spot Of Weak Anachronism Broth On The Side.