Continuity Error
Almost every episode has the same continuity error. The team will meet with a witness who will claim to have a piece of evidence to show them. It will then cut away to a single member in isolation who will repeat that the witness has a piece of evidence and they "just have to see it."
I think the problem is obvious. When did this isolated scene take place? It can't be before meeting the witness because they don't know about the evidence. And it can't be after the meeting because they would have already seen the piece of evidence.