Reportedly Myrna Loy's personal favorite movie of all her films.
The "Drake Bullet" was a Seversky P-35 single-seat fighter which had no back seat for Myrna Loy to sit in.
The four engine bomber flown by Gable and Tracy near the end of the film is one of thirteen Y1B-17 (model 299B) Flying Fortresses. The Model 299 prototype had crashed on October 30, 1935. Almost all of the Y1B-17s assigned to the 2nd Bomb Group appear flying in formation at the end of the film.
The four engine bomber flown by Gable and Tracy near the end of the film when they are flying with the simulated bomb load was a Model 299, which was bought by the Army Air Force and became the yb-17 while testing continued until it became operational as the b-17a.