Revealing mistake: Rear-screen projection is laughably obvious in all the racing scenes here - especially when two side-by-side car drivers carry on a highly-improbable mid-race conversation with the rest of the race cars wobbling badly on the screen behind them.
The Crowd Roars (1932)
1 revealing mistake - chronological order
Directed by: Howard Hawks
Starring: James Cagney, Joan Blondell, Ann Dvorak, Eric Linden
Audio problem: During Joe and Eddie's first race, you can hear the sound of squealing tires as they round the bend. But they're driving on a dirt track. Tires don't squeal on dirt. (00:15:40)