So according to the time on the invitations The Doctor sent out in The Impossible Astronaut, they were all to meet at Lake Silencio at 4:30pm. According to the Tesselector, The Doctor dies at 5:02pm, which is exactly 32 minutes later.
You will be dead in 32 minutes
Amelia Pond Voice Interface - Let’s Kill Hitler
32 minutes, as we know, is the exact amount of time it takes the poison administered to The Doctor by Melody/River to kill him. Coincidence? Never ignore a coincidence, unless you’re busy, in which case always ignore a coincidence. Luckily I’m not busy.
There was clearly more than one Doctor at play in LKH, what with the apparent costume changes (Long coat/Tuxedo/Regular outfit) and odd behaviour, even by The Doctor’s standards.
The Doctor: “Time can be rewritten.”
River Song: “Not those times. Not one line! Don’t you dare! … It’s OK. It’s OK, it’s not over for you. You’ll see me again. You’ve got all of that to come. You and me, time and space. You watch us run!”
Gender swapped Doctor and companions!
The Doctor: Nobody important? Blimey, that’s amazing. You know that in nine hundred years of time and space and I’ve never met anybody who wasn’t important before.