During the opening titles, in the opening scene where the camera zooms from an aerial shot onto Anne Bancroft, The fountain in the film is played backwards. The water flows up from the bottom of the fountain up to the top and back down into where the water spout appears from. After the aerial shot scene change, the water then runs in the correct direction.
After Inga attempts suicide by drowning herself in the bay, she arrives at hospital with perfectly styled hair.
The movie is evidently set in June, since Newell writes 6-12 (June 12) on the call sheet (visible around the 21 minute mark), and no one is dressed for cold weather. But Inga's boss is away on a ski trip, something that wouldn't happen that time of year in the Seattle area.
Inga (Bancroft) flushes her goodbye note down a toilet that doesn't appear to flush.
At one point, early in the film, Poitier in a dramatic gesture, pulls the phone cord from the receiver but continues to cover the talking end.