Gerald leaves the room after Sheila has given him back her engagement ring, but the next time she appears, she still has the engagement ring on her finger.
The dead woman is shown in a flashback having her photograph taken, and the view through the camera view finder shows the image the right way up. However, the scene is set in 1912 and in those days the view through the view finder was always upside down.
The car Arthur Birling travels in from the factory to his home is a 1931 Morris Cowley. The film is set in 1912.