Corrected entry: When Michael is having the little meeting with Hyman Roth, they are talking secrets, so Roth turns up the volume on the TV. Some seconds later, the volume is on the same stage as before Roth turned it up. It is not his wife who turns down the volume, she first enters the room later. (Obviously deliberate to hear dialogue.)
don_corleone
24th Mar 2004
The Godfather: Part II (1974)
13th Feb 2004
The Godfather: Part II (1974)
Corrected entry: When Michael is having the little meeting with Hyman Roth, they are talking secrets, so Roth turns up the volume on the TV. Some seconds later, the volume is on the same stage as before Roth turned it up. (01:00:50)
Correction: Roth's wife comes in and turns down the TV.
Correction: This occurs with the 2 men in close-up, implying that we are meant to hear what they're saying, while the TV is masking the sound to anyone else. As such it's a stylistic choice rather than a mistake.