When Joseph Losey was hospitalized for two weeks during this shoot, Dirk Bogarde continued filming assisted by minute, daily instructions over the phone from Losey's hospital bed. When Losey returned to the set he did not re-shoot any of the script, much to the relief of cast and crew.
When Tony and Susan arrive at Tony's house in the Mercedes, with an extended visit in mind, they both go into the house and Tony leaves the car's lights on.