Wouldn't you find the plot a little hard to swallow? Amnesia really?
"See, audience, we know you think this is hackneyed crap but, if we say it first, then we're being cheeky and meta and self-deprecating and a dozen other synonyms for full of shit." As if winking at the audience makes it better writing.
As others have said, it was a better episode than last week. I know, I know. Damning with faint praise. But the show is on steadier ground when it moves away from the big bads and overarching mythologies. The COTW episodes are the show's bread and butter -- construct a half-decent crime with a half-decent resolution and the show's, well, not golden exactly. Copper, perhaps? ; )