The Final Chapter: The Day in the Life - S12-E11
Revealing mistake: Aubrey takes a tablet of some kind. However if you watch closely you will see he drops it in his mug instead of in his mouth.
The Final Chapter: The Steal in the Wheels - S12-E9
Revealing mistake: When Booth launches his car off the other car in the derby, the sparks that appear don't line up with where Booth hits the car. (00:35:35)
The Final Chapter: The Flaw in the Saw - S12-E6
Revealing mistake: At the very end we see Bones and Booth on the rolling log. In the front view the log is obscured from shot however it's clear from the motions of Booth and particularly Bones that they are stood on level ground, mimicking the actions of being on the log. (00:41:00)
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 ★