Revealing mistake: In the scene where Nanny McPhee seems to suddenly "appear" to Cook, after the children have gotten sick, you can see Nanny stand up from behind the counter, if you watch closely through the red bottle as the camera passes. (00:34:05)
Revealing mistake: Whenever Mr. Brown is at his work in front of a dead man, you can easily see any of the men (if more than one) twitching and breathing. This especially occurs when Mr. Brown is talking to Simon; the man's abdomen is moving.
Revealing mistake: When Eric is using the guillotine to cut the head off Christi's teddy bear you can see the Velcro attached to the bear's head showing where it is supposed to come off.
Answer: The skull and crossbone flag can be interpreted in a number of ways. Death, both literally and symbolically, is an ongoing theme in the story. Cedric Brown, the children's father, is a widower, and he is also an undertaker. There have been a number of nannies for Mr. Brown's rather naughty children, but they have systematically gotten rid of each one, basically "killing them off," though not in a literal sense, until Nanny McPhee arrives.
raywest