At one hour and nineteen minutes - FBI agent Cowen says the trigger word, "Bullshit", when he takes over the case after the staged car accident on the bridge; agent Evans is present and hears the trigger word, but does not respond with the post-hypnotic suggestion of playing the imaginary violin. Agent Evans does respond a little later and plays the violin near the vault.
When Thaddeus comes to wish everyone good luck, Merritt stands to do a quick reading on Thaddeus. You can see Jack in the background changing his position. Switching the camera to Thaddeus and back to Merritt, you see Jack change his position again.