In "Smurfettte's Dancing Shoes," there are two gargoyles who are at the imp's side in his castle. When Papa Smurf demands the imp to set Smurfette free, the next shot shows one gargoyle at the imp's side (the one holding Smurfette). The second one (who is at the imp's right side) disappeared.
In "Smurfette's Dancing Shoes," the Smurfs were able to find the imp's castle where Smurfette is being held. However, since the imp (whom they never seen before) did not leave any physical or magical clues that will lead them to his castle, how did the Smurfs able to find it?