Plot hole: The manner in which the Microwave emitter is used to vaporize the city's water would not go as intended. Microwave emissions coming from a device located inside of a train that has a very metallic exterior will unavoidably be affected by the photoelectric effects resulting from any microwave beam that is focused at the water mains below the train from within it. A fork placed within a relatively low powered kitchen microwave would encounter a similar effect.
Batman Begins (2005)
1 plot hole - chronological order
Directed by: Christopher Nolan
Starring: Liam Neeson, Michael Caine, Morgan Freeman, Gary Oldman, Christian Bale, Cillian Murphy, Katie Holmes, Ken Watanabe
Continuity mistake: When Bruce is thrown off the truck when released from prison, you can see his bag in the background as he rolls at least 5 feet away to his right. When the angle changes and he's getting up, the bag is right in front of him, if not slightly to his left. (00:05:50)
Bruce Wayne: I'm going to show the people of Gotham that the city doesn't belong to the criminals and the corrupt. People need dramatic examples to shake them out of apathy. I can't do this as Bruce Wayne. A man is just flesh and blood and can be ignored or destroyed. But as a symbol... As a symbol, I can be incorruptible, everlasting.
More trivia for Batman Begins
Question: In the animated series Ra's Al Ghul's name is pronounced "Raishe" rhyming with race. In this movie it's pronounced "Raaz". Why the change?
Answer: "Rahz" or "Raaz" is how the name is pronounced in Arabic. The pronounciation in the animated series was purposfully done to shun the notion of Ra's being Arabic (having a terrorist be Arabic could cause problems for a children's cartoon.)