Common Sense Note
Parents need to know that Howl's Moving Castle is a gorgeous animated fantasy that includes mildly scary images (featureless blob-men, wraithlike wizards, explosions, and background war scenes) and a couple of dark night scenes. There's a bit of peril, when main characters seem to be in danger or possibly injured. Its primary imagery is magical and whimsical, including the rather charming titular castle, which clatters and wheezes, walking on mechanical legs.
Background chatter about romance; some romantic tension between central characters and discussion of being in love.
Explosions and war scenes (no bodies). Some potentially scary blob-men who chase after the main characters. Several moments of peril. One early scene where two soldiers intimidate and ogle the main female character.
A few colorful insults.
There's a strong anti-war message running throughout. Kindness wins over cruelty and selfishness. Being old is not interpreted as a negative, but instead a state where one is wiser, more peaceful. Beauty is initially coveted, but ultimately becomes irrelevant.
Drugs / Tobacco /
A character smokes a cigar, which is called a "pleasure."