(at around 28 mins) When Margaret and Mr. Bast are leaving the concert hall, he insists on carrying her program. When the camera cuts back to them, she is carrying the program again.
At 17:28, the strap of Charles's driving goggles is over his left ear. The camera cuts to another angle and then back. The strap is now behind his ear without him having adjusted it.
At around 25:51, the conductor's hands are moving out of time with the music.