Fourth time watching it and I'm just realising something... The beginning is the ending.
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If you've watched the film you know how it starts and how it ends.
On my fourth watch through I'm taking a different approach using the context I have from before.
The start of the film starts with Clementine being very forward, "Do I know you?" "I'm going to marry you I know it." What if this is them meeting again after already having the eraser once before. It would make a lot of sense how they bond quickly.
I'm not saying this is what the director intended, just head canon. Thoughts?
Edit: I don't agree with the theory that Clem and Joel go through this process many times over. I think they are only erased once but the film works in being cyclical.