The Paper-Thin Clone

''Oh, come on. Of course that's not the real one, his eyes are PITCH BLACK for Christ's sake.''

When you as an audience member can easily tell the difference between the real one the faker but no one else (except for The Smart One) can. There's usually some major feature that the clones have the real one doesn't, most commonly taking for as a change in eye color. This could annoy The Audience to see the creators go with Paper-Thin Clones in their plot as the good characters cannot tell between a clone and a genuine despite the fact the difference is painfully obvious.