You didn't mention the most important difference: Nordic countries have "free evidence exhibition", meaning that anything and everything is allowed to be presented as evidence in the courts and the judges have total liberty in deciding on how to weigh evidence.

This means evidence such as hearsay or illegally obtained evidence is given the same consideration as real evidence. Resulting many times that the court can sentence an accused that everybody "knows" is guilty, and other times resulting in mind bogglingly insane verdicts.

Another big difference: No plea deals. Which is something very strange about the American justice system.