Last of the Time Lords (3) - S3-E13
Continuity mistake: When Martha explains to Tom and Professor Docherty about how the Master could only use the TARDIS to travel between the present day and the end of the universe, and how he must have gone to Utopia, in a wide shot her right hand is resting on the table, but in a shot from above looking down on the captured Toclafane her right arm is by her side. (00:20:15)