When Candy is sent away from preschool by "the creatures", she is wearing her pink snowsuit. However, when Frank drops by their home, desperately searching for his daughter, the pink snowsuit is hanging on the cloak hook at the front door. Then again, a few moments later, Candy is wearing it walking down the street with two of "the creatures".
Just after the first murder, the deformed/mutant child who committed it leaves very large, bloody handprints on the stair railing just near the dead body. These handprints are never mentioned again, in particular by the police, who insist later that they were "never looking for anything that small." It would have been impossible to miss these handprints at the crime scene, and such child-sized handprints would have certainly tipped off the police in a different direction upon discovery.