Mistakes?

There are a couple of inconsistencies, maybe even mistakes, in the flashback sequences. When Nick Adams describes the meeting of the Swede and Colfax at the gas station he says that he thought that the car was a Cadillac but I am just about positive that the car that appears onscreen is actually a Lincoln. Later, in the scene set in the prison cell, some of Charleston's astronomical information is wrong. He says that the constellation Orion is also called the "Great Bear" but it is in reality called "The Hunter". He gets the location of the star Betelguese right and correctly describes it as a red giant but he incorrectly states that it is the brightest star in the night sky. I was wondering if anyone else had noticed these things or any other possible mistakes.