When Watson is making a sandwich she is holding a spoon at one point and in the next shot she is holding a knife without a break in conversation.
When Holmes is discussing the case after finding out he was wrong about the killer, Watson's bra strap on her left shoulder keeps appearing and disappearing, as the shots were intermingled from different "takes".
Vaccination requirements for Saudi Arabia only required Meningococcal vaccine for Hajj attenders and seasonal workers, until 2015 when all workers were included. So Rourke would not have needed it.