The champagne bottle changes position when Guido is describing how to serve lobster (first it's tilted towards the right, then centered, then tilted again, etc.). Also, the bottle is first completely sealed (with all the labels and stuff) and then we can see it without all those labels, to appear completely sealed again in a backward-to-forward take, and then opened again.
After Dora told Guido that her father could make her do whatever he wanted and Guido makes an analogy with the jewel box, we see him with his right arm extended as he starts the sentence, but the scene suddenly changes as he continues, but his hand is near his chest.
When the concentration camp is being evacuated, a half-track with the Balkenkreuz painted on it can be seen. Actually, this vehicle is an American-made M3 Half-track which was used by the Allied forces during the war and not by the Germans (although captured M3s were used by the Nazis in North Africa and on the western front).
When Dora looks out her barrack to listen to the opera piece, her long hair can be seen under her scarf. In concentration camps, women's heads were regularly shaved to prevent the proliferation of lice.