When Valentin passes out on the boat, he's wearing dark heavy weather gear with the hood around his face. When he comes to, he's dressed in trousers and a pale blue shirt.
When Valentin is entering the harbor on his sailboat, he sails by the same boat twice.
In the dream sequence toward the end at the jazz club, there are a couple of shots where the trumpet player is clearly not playing, but yet the sounds of a trumpet are still heard.