Aside from the glaring mistakes as Roman has put it...
The whole book was in my mind a satirical outlook on the female-male battle of the sexes thing.
I don't know if Terry had intended this but this is how i saw it.

(Excuse me... I am a feminist - this is my opinion and if it offends somebody i'm sorry)

Women in war are always the people who suffer the most. Through the ages who always bore the brunt of all the consequenses of war- the raping and pillaging, slaving, the cost of getting your life together when there is no more men left.

But women in that sense are a lot stronger than men because even in the face of absolute desolation we can always go on.

In a more general sense it just about women most of the time can do the same things as men and maybe sometimes do them better.
I liked MR in that sense - but it was dark bout in a silly way.
I must say i agree with roman - i liked NightWatch much better.