While Barbara and Antony are sitting in a bistro, she attributes the quote "when a man is tired of Paris he is tired of life" to Fitzgerald or Hemingway. The correct quote is "when a man is tired of London he is tired of life", by Samuel Johnson.
When Barbara and Tony first walk through the park in Paris, they pass a little girl, and a young woman walks into frame towards them. In the next shot, the little girl is in a different position and the young woman is gone.
When Tony meets Blanca on the beach, he first talks to Jake. As Tony and Blanca chat, and she decides to turn on her radio, a woman inexplicably appears on Tony's immediate left, as though she knows them. When Blanca starts dancing in front of Tony, the other woman is gone.