In any action to review any order or decision of the Commission, a transcript of the testimony taken, together with all exhibits or copies thereof introduced, and of the pleadings, records, proceedings and orders in the case, which shall be accompanied by any opinion or memorandum of the Commission concerning it, shall constitute the record of the Commission on the review, except that on review of an order or decision of the Commission the parties interested in the result and the Commission may stipulate that a certain question or questions alone and specified portion only of the evidence shall be certified to the court for its judgment, whereupon such stipulation and the question or questions and the evidence therein specified shall constitute the record for review.