So, just a big ol' metaphor? (SPOILER-ISH)
I'm honestly not sure what I make of the movie, as a whole. The beginning had me totally invested in the story, Beth "resurrecting" and Zach's (as well as her parent's) management of the situation was interesting and funny to boot. I feel everything took a turn for the worse when the whole "zombie apocalypse" started. I feel like that part of the plot detracted from the overall love story between Zach and Beth (which should be the central theme/plot of the movie)
I completely missed the importance of "Pearline"(?), the story suggested she would have some answers (if only by way of making a joke) and yet she was never again featured in the film? How did the resurrections happen, and why?
The only way I feel the narrative makes overall sense is if the entire film is, fundamentally a metaphor about dealing with either;
A) Death: (bear with me I'm not sure of the correct order of, or steps here)
Zach is "angry"/"depressed" about the death of Beth at the beginning, he's withdrawn from the world around him, not eating, fighting with his family etc.
He's then in "denial" when hes convinced he's seen Beth alive within her house.
He moves onto "bargaining", telling himself that having this version (zombie) of Beth is better than losing her all together, convincing himself he's happy with the situation, so long as he has Beth in his life.
Finally (when Kendrick's character is introduced) he moves onto "acceptance" and realizes he needs to move on with his life.
However this idea only really applies to the beginning half of the movie, which is why the zombie apocalypse aspect threw me off.
B) Ending a relationship: Zach is depressed and lonely, having lost Beth (since its specifically stated that she ended the relationship with him)
He regrets everything he could have/should have done with her to maintain the relationship, ie; hiking, "flamingo"(ha) class etc.
Having completely lost her after trying to reconcile with her (the singing on the beach) it feels as though its the end of the world (zombie apocalypse)
Finally he realizes that although he'll always love her, they have to be apart (he kills her)
I know realistically these ideas don't mesh with the overall storyline, just what I left the movie thinking about, and although its rare that these kind of films leave me thinking about a possible motive behind the story, I can't tell whether this film in particular left me feeling that way because it was overly lacking in a point!