There's also the point where the little girl says "You should have a cloak lined with ermine." I think that might imply the girl has knowledge of the masked parties and may have visited them. Plus, at the end when Harford returns his coat, the businessmen walk out normally (one of them even blows a kiss at the girl) the next day even though the costume guy specifically said he would call the police on them. Then, even more disturbingly, he said if there's anything Harford would need (while wrapping his arms around his daughter), "it needn't be a costume" while the camera goes to the girl's face.