Also, if you watch the film once, there are lots of things that you won't get because there are punch lines in the first act, the setup to which isn't until the second act. ↗
That's what we wanted to get across in that moment, particularly when Shaun goes to the shop when he's all hung over. He doesn't notice any of the zombies around him just because he never had before, so why should he at that point? ↗
We don't watch the film anymore because we've seen it so many times, so we'll introduce it, walk out and we'll come back in right about when I wake up in the morning and walk over to the shop and everything's changed. ↗
Generality is, indeed, an indispensable ingredient of reality; for mere individual existence or actuality without any regularity whatever is a nullity. Chaos is pure nothing. ↗