The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Moira is telling Banshee that Xavier has given everything for his students, she has her left hand placed on Banshee's right arm, and her right arm is down at her side. Then when she remarks that she thinks she's the only friend Xavier has, she is running her fingers through her hair. When this scene was shown in the previous episode however, she is grasping Banshee's arm with both of her hands, and she never runs her fingers through her hair. (00:02:26)