After Claudia poisons and stabs Lestat and he's lying on the floor, bleeding, he begins to wither and turn gray. However, only his face and left hand start to decay--the makeup team forgot to do his right hand. Later on in the movie Lestat returns from the "dead", and chases after Claudia. At the scene when Lestat and Claudia are around the table and Lestat jumps at her, his shirt lifts up in back and you can see the un-makeuped skin. It's fast, so look pretty close.