Other mistake: In the scene when the helicopters arrive over the research center, look at the heli in the bottom right - it just fades out, while one on the left materialises, and the one in the middle changes position. Notice that after all the helicopters have changed place, you can see the helicopter that faded out appear on the helipad
Other mistake: In the bobsled chase, Blofeld arms a grenade, which drops to the floor of his sled, where it rolls around with every turn. He arms and throws a second grenade onto the track, where it is detonated by Bond's sled. The original armed grenade loose in Blofeld's sled never detonates, even when that sled crashes.
Other mistake: As the assault on Piz Gloria begins and the helicopters approach the facility, on the right of the screen one seems to be hovering near the helipad as another passes behind it. The helicopter in front fades to a slightly different position as the one passing it disappears and reappears several meters ahead. On the left of the screen the third helicopter appears out of thin air. (This was obviously caused by a dissolve effect, but since the sound effects are constant there doesn't seem to be any indication that a visible edit or time shift was intended for this scene, so it's a mistake).