The Sarah Jane Adventures (2007)
0 revealing mistakes in season 5 - chronological order
Starring: Alexander Armstrong, Daniel Anthony, Elisabeth Sladen, Tommy Knight
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Mona Lisa's Revenge (1) - S3-E10
Other mistake: Mr. Smith scans the Mona Lisa and determines that it is genuine from DaVinci's brush strokes. He should have also noticed the words "This is a fake" written in felt tip under the paint, from when The Doctor replaced the Mona Lisa with one of DaVinci's "forgeries" in "City of Death."