The legal standard for a conviction/judgement also changes, from "beyond a reasonable doubt" in criminal to "preponderance of the evidence" in civil- i.e. 99.9% certainty becomes 51% certainty.
Every criminal case involves more than a jury. The prosecutor has to decide to bring charges, judge has to accept the case, etc. Death penalty cases are more involved. I've sat through the automatic appeals that were part of California's process.