When Elektra closes her cell phone on McCabe, a dial tone can be heard. Cell phones don't have dial tones. Even if they did, Elektra hung up, so nothing would be heard.
While filming a sai/sword fight, Will Yun Lee accidentally sliced Jennifer Garner's knuckles with his sword. After Garner got her knuckles patched up, and they resumed, Lee subsequently sliced her again in the exact same spot.