Not the best episode, but am I disappointed? Certainly not.
The downfalls for me:
Stupid Olivia happy moments
Peter jumping onto the floating kid (and they weren't even hurt...)
Son's reaction to his dad didn't make sense
Not enough development of the dad's story, and connection to the overarching story
Cheesy Bell voice at the end
With this in mind, the episode did show promise, unlike some of the previous episodes. I loved the theme of being so close yet still out of reach that applies to the dad, Walter, Peter, Olivia, and William (in a more literal sense.) I LOVED the bell moment. I had been speculating that the bell served to reawaken something subconscious but never would of expected it would be Bell's soul, and even after that, I never would expected it to be channeled through Olivia. And then seeing the lead up to this from the end of season 1, I really appreciated that.
But the writing seems to have undergone some weird mediocrity recently. They have all these great ideas, and great leads, and then they're executed very poorly. Writing off the osmium effect as due to universal degradation? That didn't even make sense. Walter was talking about equilibrium and he drops the mints in the coke and it lifts into air. I was convinced that was what would've lead to his explanation for the floating effect. Infact, that whole scene sort of had that give-away moment where you know they're gonna introduce something to enable Walter to solve the case. All these signs point to the floating as a result of body equilibrium reacting in opposition to the dense metal. Of course, this isn't real science, as equilibrium couldn't produce a stronger opposite effect, but I could've sworn this is what the authors intended to use as an explanation.
Too many elements, too underdeveloped, but shows promise, ending was great.