Goofs

Around the 59 minute mark, when Ma Barker and her son Fred are situated outdoors at their hide-away, Fred is seated in a fancy wicker chair that has a curved back.

When the couple hear Machine Gun Kelly and his posse drive up, Fred slips into the house---the curvature of the chair's armrest can still be seen.

However, when Machine Gun Kelly steps out of the car and walks toward the wicker table where Ma Barker is now seated, Fred's former chair has been replaced with a much plainer, reeded-back, armless chair.

Although set in the mid-1930s, one of the cars parked on the street in front of a bank that is to be robbed is a 1955 Chevy.

During the armored car robbery set in Depression-era, 1950's cars can be spotted on the nearby freeway, and the getaway car passes a parking lot full of cars not sold for 25 years. The armored car itself is an early 1950s International Harvester panel truck.

In the opening scene in the rural church, behind the altar hangs Walter Sallman's painting "Head of Christ" which he completed in 1940, six years after Ma Barker's death in 1934.

On Machine Gun Kelly's first entrance, what looks to be a boom mic can be seen in the top left hand corner of the shot.