 FACT: Towards the beginning of the movie, a caption gives the year  as 1984. When asked, the police officer gives the date as Thursday  May 12 but, in 1984, May 12 was a Saturday. All manner of  explanations have been given (mainly revolving around the  policemans mistake being induced by fear while a gun is pointed at  his face), but the most likely is that it is a genuine goof and that  the line was overlooked when the script was revised to be set in  1984 instead of 1983 (when May 12 did, indeed, fall on a Thursday).