1) Arkham Asylum
One of the movie’s finale scenes – where Batman faces the newly-bald Lex in prison – is basically the same in the extended cut. Except for one juicy addition that will interest Bat-fans.
When Lex proclaims that he won’t stand trial for his crimes because he has been certified insane, Batman reveals that he knows. To ensure Luthor gets what he deserves, he has arranged for Lex to be sent to Arkham Asylum – where “some friends” of Batman’s are expecting him…
This is a welcome reference to the infamous madhouse, and a nice oblique nod to Batman’s rogues gallery. Of course, it would have been even more fun to see Lex arriving in Arkham, perhaps with glimpses of the Joker and other villains in their cells. We’ll probably have to wait until the next Batman solo film for something like that, though.