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.
In The Dark Knight Rises, the plane which was used by the CIA operative to transport Dr. Pavel crashed in real life almost a year after this movie was released. The aircraft, an Embraer EMB-110 Bandeirante registered ZS-NVB, crashed on June 29, 2013, in Botswana. The pilot and co-pilot died in the crash.
In Dark Knight, Bruce Wayne drives a Lamborghini Murcielago. The Spanish word for “bat” is “murciélago.”
The scene where Bruce Wayne test drives the Tumbler in a huge white room, was shot in the interior of the Excel Exhibition Centre in East London. The separating walls had been pulled back to allow the Tumbler to drive around, but you can still see the hall numbers as they drive by them (N4, N5, et cetera).
In The Dark Knight, during the chase scene, when The Joker takes over driving the semi after his driver is killed, the bullet holes on the windshield form a smiley face.
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The Bat symbol at the beginning of each movie in the trilogy foreshadows something that happens later. In the Dark Knight Rises, the Bat Symbol is made up of cracking ice, and it symbolizes people falling through the icy river as they are forced to walk across it.
In The Dark Knight, during the hospital scene Aaron Eckhart spoke about a unique experience he had with Heath Ledger. He said that before lines were exchanged, Ledger would just walk around, in character, mumbling to himself in an odd manner. All Eckhart could do at the time was just watch him while still in character. This went on for several minutes, until Ledger got close to him. Eckhart felt compelled at this point to fiercely raise his hand up. Immediately, Ledger grabbed Eckhart's raised hand in an equally matched fierce manner. When the scene was over, Ledger, now out of character, told Eckhart “That's what acting's all about.”
In Batman Begins, the homeless man that gets Bruce's coat was Rade Serbedzija. He is the same actor that played the father out for revenge in Taken 2 (2012), also featuring Liam Neeson.