The airplane that Storm is shown as flying in to the big race at Dayton is a Travel Air E-4000 with registration NC9048. It was built in 1928 and according to FAA records it is still flying as of 2021.
Indianapolis 500 back in 1935, today it is the middle of the city, back then it was way out of town in the country, you can see this as the cars circle around and around on the all Brick Raceway.
Although First National Pictures, Inc. is the original registered copyright owner of this film, the onscreen copyright statement lists Warner Bros. Pictures, Inc. The opening credits list Warner Bros. as the producing studio but the closing credits list First National.
In the final race, the pit stall for the Sanford Special #7 driven by "Bulldog" Banks is to the right of the stall for the Mardo Eight #35 driven by "Stubby" Stubblefield. This production was released in early 1935 and Stubby would be killed later in the year attempting to qualify for the Indianapolis 500 where the racing footage was shot. Second year driver Rex Mays won the pole qualifying #35 at the 1934 Indianapolis 500 and would be killed 15 years later in a race at the Del Mar Fairgrounds.
This production and another Warner's production Indianapolis Speedway (1939) both have the same fictional 'SUNIONA' fuel truck in the same position relative to the pit wall and stalls of the subject competitive conveyances.