During the autopsy when WPC Tennison is helping Dr. Martin with the demonstration of how the victim was beaten as she lays flat on the floor of the morgue she disappears.
The series is set in 1973. There are repeated references throughout the series to the Homerton Hospital. This was built in the 1980s and only opened in 1986. In 1973, the local general hospital was the Hackney Hospital. The Homerton had not been built.
The coroner is seen wearing latex gloves during autopsies. Gloves of any kind were highly unusual in autopsies until the 1980s. If gloves were used they would have non-disposable, thick rubber surgical gloves.