The planted evidence was a false lead, a red herring meant to throw off the detectives.
The noise outside was just a distraction, a red herring to throw us off.
The misleading clues were just a form of misdirection, a red herring to confuse the investigators.
The elaborate story was just a smokescreen, a red herring to conceal the truth.
The suspicious behavior was just a decoy, a red herring to divert attention from the real culprit.