After agreeing to hire him, Stan says to Silas: "Be at this address Monday at 8:00 o'clock." When Silas picks up Mr. Wells, "December 30, 1952" is on the screen. December 30, 1952 was actually a Tuesday.
When the bartender is giving the free coffee to Hank's driver, there is a neon advertising sign that says "Leinies". Leinie's aka Leinenkugel's was a local beer & was not available outside of the state of Wisconsin at that time period.