Mont. Code Ann. § 85-7-2203

The court hearing any of the contests or proceedings herein provided for shall disregard any error, irregularity, or omission which does not affect the substantial rights of the parties to said action or proceeding. The rules of pleading and practice provided by Title 25 which are not inconsistent with the provisions of this chapter are applicable to all actions or proceedings herein provided for. The costs of any such hearing or contest may be allowed and apportioned between the parties or taxed to the losing parties, in the discretion of the court.