Rosario Dawson (Claire Temple) and Mike Colter (Luke Cage) have both appeared in the Men In Black Franchise, Rosario Dawson played Laura Vasquez in MIB2, and Mike Colter played the Colonel in MIB3.
Jessica Jones:
Nice ears.
Daredevil:
They're horns.
The Hand is repeatedly referred to as being a global entity. Yet the "plan" to defeat them seems to be the thought that killing the leadership in New York and few of its soldiers will somehow defeat it. Worse, this very obvious flaw in logic is never addressed by the protagonists.
The opening credits are a sequence of cityscapes of New York, with colored silhouettes of the Defenders (Daredevil in red, Jessica Jones in blue/purple, Luke Cage in yellow/orange and Iron Fist in green), following themes from previous shows.
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