Murdoch and the Temple of Death - S8-E10
Continuity mistake: When Murdoch and Dr. Bajjali reach the grail chamber, the detective tosses a coin on the pedestal to see if it's trapped. The coin triggers the firetrap and falls to the ground. Murdoch then throws another coin which ends up resting on top of the pedestal, next to the fake grail. Now, when the detective removes the pedestal cover, there is a quick cut when both coins can be seen on the top of it, despite that the first one is supposed to lie on the ground.