Four deleted scenes offer a slightly alternate ending amongst the crowd. A selection of three commentaries lets fans in on everything, and one comes from composer Marco Beltrami. The latter is a unique take on a commentary given his involvement in the film and the fact that the track features only him.
Also of note is how the extras can be accessed. Everything is accessible by pressing the colored buttons on the Blu-ray remote during the film. While a nice option, these features are only relevant to the current scene, and there’s no indicator to tell you when there’s something available. It becomes guess work, and it’s far easier to just select what you want from the main menu. 
There are multiple references to the sci-fi classic Hitchhikers Guide to the Galaxy. The first robot to appear on screen carries the number 42 on his head. Will Smith later says his only good day was a Thursday. Minor, but notable trivia.
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