At 28.45 in, Petra goes into the lift with one hairstyle, relatively straight hair, partially pulled back, and when the scene cuts to her coming out of the lift, she has a completely different hair style, curly hair, totally loose.
At 33.50, Petra enters the lift with relatively straight, loose hair, with an open handbag on her right shoulder, a jacket over her left arm and a briefcase in her left hand. When the scene cuts to her leaving the lift, the handbag is closed. She puts them all down, changes jackets and walks off with only her handbag and no briefcase. By the time she walks to and reaches the office, her hair is partially tied back.