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When the alien's hand comes out of the coal grate for Morgan, if you look closely you will see that the hand was already through the grate and the alien was using its colour changing abilities to hide. So if you look very closely you will that that the hand comes UP from the grate and not through it, and if you look VERY carefully you can see the outline of the hand even before Morgen says "What?" See more...
Signs (2002) - 1 major mistake
Directed by M. Night Shyamalan, starring Joaquin Phoenix, Mel Gibson, Rory Culkin (add more)