Can an amendment of a pretrial order be reversed?

Absent abuse of discretion and prejudice, the district court's decision on amendment of a pretrial order may not be reversed. Angle v. Sky Chef, Inc., 535 F.2d 492, 495 (9th Cir.1976). Amendment to the pretrial order should be permitted where no significant injury results to the opposing party, refusal might result in injustice, and the inconvenience to the court is slight. Id.