I've assumed or guessed that the noisy bulb had weak spots in the coiled coil filament that changed how they mechanically respond to the temperature cycling at 120 or 100 thermal cycles per second, thereby making them noisier at end of life. I don't know if I read that or am just extrapolating from how burned out bulbs look. Halogen lamps extend the life of incandescent lamps by allowing evaporated tungsten to redeposit on the filament, which says something about the general failure mechanism.