When Joanna is in the boat with Captain Meadows the boat is moving along slowly along the river in the long shots but when the camera cuts to close ups the water in the background is very obviously stationary and the boat not moving at all.
The action takes place on 21 June 1943 exactly one year after the inn was destroyed on the same day Tobruk fell. The calendar in the ghostly inn shows 21 June 1942 as a Thursday. In fact 21 June 1942 was a Sunday.
The concert at the beginning of the film is given by a reduced sized orchestra of about thirty players, but the soundtrack is of a full-sized symphony orchestra with at least double he number of musicians.
A bomb was dropped on the Welsh village of Cwmbach in 1941 as a result of the bombing of Swansea, south Wales. In the film we are given to understand that Cwmbach is in north Wales as it is referred to being near to Llandudno.