Question

Under what circumstances is it possible to appeal a case before the final decision is made?

There is question about whether the trial judge is interpreting the law correctly. There is question about whether the trial court has the proper jurisdiction in the case.
There is question about whether the verdict will be the correct one.
There is question about whether the trial is fair.

Answer 1

The court of appeals decision usually will be the final word in the case, unless it sends the case back to the trial court for additional proceedings, or the parties ask the U.S. Supreme Court to review the case. In some cases the decision may be reviewed en banc, that is, by a larger group of judges (usually all) of the court of appeals for the circuit.

I think that answers the first question

Answer 2

There is question about whether the trial is fair.

Step-by-step explanation:

An appeal is a formal review of the finding of a trial court (or intermediate appeal court if the case is being reviewed by a supreme court). However, the losing party in a lawsuit cannot appeal simply because he or she does not like the court's decision. Appellate courts only hear cases when there is an error in the original case that was harmful enough to have an affect on the final decision. And they only rule on issues of law; the purpose of an appeal is not to review any of the facts involved in the case.