Because footage shot during the actual 1950 Indy 500 was used, Mauri Rose can be seen exiting the pits driving past the pit for the real car #17, Joie Chitwood (Mauri Rose and Joie Chitwood's pits were next to each other during the 1950 500 race).
During the "pit race," the closer shots were filmed with prominent "Mike Brannan" and "Brannan Spl." On the pit wall, but after a cut, the real #17 car is shown in actual race footage, which has no "Mike Brannan Spl." painted on the car just forward of the windshield, a tire obscures most of Joie Chitwood's name on the pit wall, and the pit wall is marked "Wolfe Spl.".
Before the final pit stop, the windscreen on Brannan's car is almost opaque with dirt and grime. During the pit stop, Brannan is given a rag to wipe the windscreen and it is pretty clean when he finishes. After he leaves the pits, his windscreen is as dirty as it was before and in the same pattern.
When Mike Brannan stops while walking the Green Grove racetrack, he blots out half the grandstand behind him. In the next scene, he takes two steps to Regina at the railing, and the grandstand is over his left and right shoulders.
The rail on the inside of the oval at Greengrove Race Track, as present during the night scene when Brannan is inspecting the driving surface, is constructed differently from the rail in the very next scene, showing the race that supposedly takes place on the same track the following day.