Recurring Character Observation
Not sure if this has been brought up before but I wanted to point out a recurring trait in Nolan's films, which his protagonists' share. Not all but most.
That is they have dead wives/partners/spouses/love interests etc.
Following - exception to the rule.
Memento - the whole plot is based on the revenge of his dead wife.
Insomnia - another exception, but Al Pacino's character does shoot and kill his "partner".
The Prestige - Hugh Jackman's character's wife drowns and sparks the rivalry between him and Christian Bale's character.
Batman Trilogy - Two of Bruce Wayne's love interests die - Rachel and Talia
Inception - The death of Cobb's wife is a pivotal plot point.
Interstellar - Cooper mentions that his wife passed away from a disease or something.
Probably not a big deal or just a simple coincidence but it's interesting nonetheless. For a few of those examples though, it does create a major emotional arc for the characters so it is significant in a way.