1Scarecrow first encounter
In Batman Begins, the Scarecrow's (Cillian Murphy's) and Batman's (Christian Bale's) first encounter is more like Batman: The Animated Series: Nothing to Fear (1992) than the comics. Both titles featured Batman trying to foil The Scarecrow's arson attempt, failing and being drugged by the villain's fear toxin.
In the Dark Knight Rises, during the motorcycle chase scene, Bane is wearing a red helmet with black visor, as well as a brown motorcycle jacket. This is the original costume Jason Todd took under his Red Hood persona, which is a callback to The Joker's original criminal identity.
3Harvey and Joker
In the Dark Knight, when Harvey holds The Joker at gunpoint in the hospital scene, you can see that The Joker is actually holding the revolver's hammer with his finger, thus preventing the shot in case Harvey's coin lands on "bad" side.
In Batman Begins, Batman rescues Rachel Dawes and is evading the police with the Batmobile/Tumbler on I-17 in Gotham City. The city and highway fictitiously exist on the eastern seaboard of the United States. The real I-17 is one hundred forty-six miles long, and exists entirely in the state of Arizona, linking Phoenix to Flagstaff.
Dr. Jonathan Crane a.k.a. The Scarecrow (Cillian Murphy) is the only villain to appear in all three of The Dark Knight movies.
6Dark Knight bus scene
In the Dark Knight, the bus crashing backward into the bank in the opening sequence was much harder to pull off than was anticipated. The bus had to be taken apart and reassembled inside the building (a disused post office), concealed behind a large false wall, and then propelled backward with an air cannon.
7Bane and Batman
In Dark Knight Rises, during Bane's first encounter with Batman, Bane can be heard producing loud, heavy thuds while walking, while Batman's footsteps make very little sound at all on the steel grating of the walkways. This was intentionally done by the sound effects team to further contrast Bane’s “brute” style from Batman’s “stealth” method of combat.
In Batman Begins, a pair of Batman pajama bottoms can be seen hanging from the line in the scene where Batman talks to the little boy in the Narrows.
In Dark Knight Rises, Bane's theme is a chant which features the term "deshi basara", which is Moroccan for the word "rise."
In Batman Begins, when Christian Bale and Liam Neeson were fighting on the frozen lake, they could hear the ice cracking beneath their feet. The next day, the lake had completely melted.