This episode follows the Fringe team's investigation into a man who mysteriously hardens and then explodes, killing those around him. The case leads them to Iraq, a secret government project, and an AWOL colonel.
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The previous episode was about a boy whose genetic condition and subsequent treatment allowed him to escape from his burial casket.
The Observer receives and reviews photographs of Walter from a secretive courier at the end of the episode.
The two Canadian National locomotives in 'Night Of Desirable Objects' each bear the logo "CN". This foreshadowed the goal of "Project Tin Man" in 'Fracture', to combat the effects of Cyanogen, a nerve gas with a chemical formula of (CN)2, and alludes to the fact that the Cyanogen-related explosion occurred in a train station.
As Diane Burgess exits her cab in 'Fracture', the symbol drawn by William Bell for Olivia in 'Momentum Deferred' is visible on a stone fence post.
Officer Gillespie exploded in such a way in "Fracture". (Image 1)
The Observers have invaded Earth in 2015 in "Letters of Transit". (Image 1)