Not to belabor my points or anything, and I will say “The Empty Hearse” played slightly better on a second viewing, but there are still a few things . . .
1. Surely Mary has seen pictures of Sherlock? So why did it take her so long to recognize him at the restaurant? Or was that an act?
2. I don’t get why the train enthusiast didn’t immediately know about and/or think of the siding where the bomb carriage (car) was parked.
3. No, Sherlock, bombs do not always have an off switch. Many terrorists aren’t all that concerned about finding themselves in trouble. Many would be more concerned that someone might switch off their bomb. So this is lazy writing, really. Better to have come up with a way to put the bomb in a vacuum; an ignitor needs oxygen to detonate.
A nice touch I noticed last night but had missed the first time was Sherlock’s startled moment when John says, “You love it.” For a second there, Sherlock was worried John had figured it out.
P.S. Interesting that Mary tells John he should have something on a t-shirt. Watch for that to come up again in “His Last Vow.” Is there a deeper link between Mary and Magnuson (that is, deeper than the one revealed in “His Last Vow”)? Or is this just an attempt at a running joke?