It depends. In the statute we have, in the considerations, is there a new matter of significance that was not previously considered by the court? A new matter of significance can be new information or new evidence. That is sometimes one of the first indicators. If there's something new and it wasn't previously considered, it may call into question the reliability of the verdict.
To distinguish between evidence and an error of law, which you launched your question by saying, there are circumstances in which the law evolves and the legal society becomes more informed of how the law should be applied in the present day. Evolution in the law is something that could be looked at.