Why don't they ever notice the date
(By this I don't mean, why don't the characters notice the CGI date appearing in the shot of each new year. That would be dumb).
No, I mean- why don't the characters ever pick up on the fact that so many important events occur on the 15th of July? It always niggled at me. I mean, surely they'd remember that the 15th of July was the first day they properly met as it was St Swithin's Day. Especially Emma, as she's always recording things down in poetry in her notebook. And it just seems like something you would remember.
And they never seem to realise that all these other things occur on the 15th of July- when they have that fight that leads to them not talking for ages, when they then re-unite at the wedding, when they kiss again in France and decide to start a relationship, when they decide to try and have children...
The only thing that is picked up on is that Emma dies on St Swithin's Day- but even then, when Dexter takes his daughter to that mountain- why then doesn't he remember, "Oh, this was where Emma and I went the first proper day we spent in each others company- oh and that was on St Swithin's Day too!"
I mean, I know it's all very coincidental, so maybe David Nicholl/the producers etc. felt that the audience would pick up on this more if the characters referred to it? That's all I can think of.