Blake Edwards was the original writer and director on the project. He stepped aside as director after creative differences with star Clint Eastwood. The earlier Burt Reynolds movie Rough Cut (1980) was also originally intended to be directed by Edwards who left that project too. Edwards and Reynolds did in fact work together on The Man Who Loved Women (1983), made and released about a year before this movie.
According to Burt Reynolds in his memoir, Clint Eastwood actually orchestrated the removal of Blake Edwards by goading him into quitting, in favor of Richard Benjamin, a less intense, less expensive director.
In the scene where Lt. Speer breaks into the mobster's home to get the slug upon which to run ballistics the mobster asks Speer if Speer has a warrant. The movie takes place prior to 1934 and the repeal of prohibition. There was no requirement for police to have warrants to search citizens' property or to seize such property until the 1940's.
In the gunfight scene in the street, when Lt. Speer is walking down the street with the pump-action shotgun, the audio is of the action being operated in one fluid motion, while the video shows the action being pulled open, Speer pauses momentarily, and then closes the action, with no sound.
The doctor tells Lt. Speer that Ginny broke her arm when she was hit by the car. However, when she reappears at the end of the movie singing in the club, she is not wearing a cast or showing any sign of injury.