When Marlon Brando is in court grilling the Doctor. His glasses are on, then they pan away from him for a moment then back to him and his glasses are up on his head. Then they pan away for just a second, and when they go back to him, they are down again. Very subtle but easy to notice.
When Susan walks in on Ben and Stanley on Christmas day, she is carrying 2 suitcases and does not have her jacket draped on her shoulders. In the next scene, she is leaving the room with the jacket around her shoulders, is carrying only 1 suitcase and it is different than either of the ones she was carrying initially.
When the camera pulls away from the court house (Harare City Hall) a bus drives past displaying an advertisement for Balkan Bulgarian Airlines, which flew to Zimbabwe, but not to South Africa under apartheid during the 1970s.