The Final Chapter: The End in the End - S12-E12
Continuity mistake: When Booth finds Bones she has a piece of glass on her face that turns into 3 pieces then back to 1. (00:03:00)
The Final Chapter: The Flaw in the Saw - S12-E6
Continuity mistake: At the start the intern puts the liver to one side, which promptly disappears.
The Final Chapter: The Day in the Life - S12-E11
Continuity mistake: In Brennan's segment of the episode, the cake on Angela's fork disappears after Brennan points out that saying Booth's aura is "as clean as it's ever been" was sarcasm.
Answer: Answering my own question here but, having contacted various people involved in the production of Bones including Kathy Reichs, Hart Hanson, Eric Milligan, and Deirdre Lovegood who portrayed Taffet onscreen I finally have the answer. No-one know how she did it due to her constantly working alone. And she never revealed this information before her death.
Ssiscool ★