Well known brand names of tire makers are deliberately misspelled. Although the fonts look like from the tire makers you can see "Firestom" or "Good Yard" on the race cars. Even though people knew the brands, because of a slight difference they don't have to pay a license fee.
Some of the stock footage of the final race was of a modified race at Martinsville Speedway in Martinsville, Virginia.
When Murdoch is talking to Peck about where Ludwig gets his money he says, "He probably gets it the old fashioned way, by earning it." This is reference to the then popular TV commercial for Smith Barney, where John House would say , "They make money the old-fashioned way. They *earn* it." Murdoch doesn't repeat verbatim, so that they wouldn't have to pay a licensing fee.