Continuity mistake: When the roulette scene starts there is a man wearing a fez hat next to a guy, both giving their backs to the croupier. A shot later they've suddenly turned 180° around.
Continuity mistake: When Rick goes to see Ferrari at the Blue Parrot they shake hands and the people behind drastically change between shots.
Continuity mistake: In France, the way Rick holds Ilsa's goodbye note differs between the wide and close up shot.
Continuity mistake: In France, when Rick tells Ilsa they must leave her left hand is next to her neck. In the following shot it's gone.
Continuity mistake: The man that tries to sell a ring to Laszlo holds it differently depending on the shot.
Continuity mistake: When Ugarte escapes he turns around and shoots man by the door who falls backwards. From the immediate shot from behind the door the man is gone, and he's been replaced by a guard trying to exit through the door.
Continuity mistake: Rick and Renault walk inside the cafe to grab the 20,000 francs while the Italian and French officers discuss. A woman turns around and stares at them. A shot later she is facing forward.
Continuity mistake: Renault and Rick are watching the Lisbon airplane. Rick puts a cigarette in his mouth, unlit. From the angle shot from behind, the cigarette is gone, and smoke is coming from his hand below.
Continuity mistake: When Rick signs the check, note the word OK. The handwriting is completely different between the first and second shot (a ribbon-like streak appears next to the K in the second shot).
Continuity mistake: When Rick is about to sign the check, his left hand appears in the close-up shot, but disappears on the rest of the shots.
Continuity mistake: After the German is shot next to the poster, a stool and a vase magically appear next to him.
Continuity mistake: When the man whose passport is due is about to be shot, check the left side of the screen. There's a man with a black hat with no-one by his left. A shot later a man with a white hat and black beard appears.
Continuity mistake: While waiting for Ilsa at the train station prior to leaving Paris he and Dooley are getting soaked by heavy rain. When they board the train a moment later they are both completely dry.
Answer: It's a bit complicated and subject to interpretation. They all look as soon as they hear the engines starting. For each one it signifies something different. Ilsa knows she must part with Rick, the man she loves, and stay with her husband, Victor, to support him and help with his work. For Rick, he knows he is losing Ilsa, by his own choice because he has chosen to stay behind to aid the war resistance and may not survive. Victor knows his wife Ilsa really loves Rick and he will be out of their lives, but she is staying with him out of duty.
raywest ★