The Creep should've been in live form at the end of the movie
At the beginning of the movie when the creep was in live form at Billy's window, he looked creepy as hell. Then everything mellowed down a bit when he switched to cartoon form.
They should've at least used the creep in live form at the end of the movie when he closed the creepshow book and put the candle out in his dungeon. Just imagine that live rotten skeletal corpse with huge eyeballs staring right at you (without Billy's window in the way) before fading to black with the closing credits