Was any of Eva's trust misplaced? Were there any red flags about those they should not have trusted?

Eva has to risk her and her mother's safety on numerous occasions by trusting others. Was any of this trust misplaced? Were there any red flags about those they should not have trusted?

One red flag for me in regards to Joseph was how much he seemed to like himself. And, in the end he certainly valued himself over all others.

Eva was too trusting of Joseph because she grew up with him and because he warned her about the possible roundup in Paris. A couple of red flags about him are that he told Genevieve about her father and that he visited her mother often without her knowledge.