You either love or hate Harry Potter 1 & 2. I guess that's why they brought in a new director, Alfonso Cuarón, whom is also known for steamy movies! In countries like Australia, this movie was rated for Adults ! Still doesn't explain the copy-cat concept in this sequel :(

Whatzisname's on the loose! - Potter fans would know Sirius Black has escaped from the Prison of Azkhaban, and is likely in pursuit of Harry Potter(Daniel Radcliffe). Black allegedly played in part in the murder of Potter's parents, though Potter was saved from the brink of death by the scar on his forehead. If you want to know the whole story, well.. read the book! :D

Back to the movie, needless to say, Potter and his band of sidekicks consisting of Ron Weasley(Rupert Grint) and Hermione Granger (Emma Watson), gets into trouble while trying to save the day.

Recycled Villains! - If you've watched Van Helsing(VH) and Lord of the Rings 1 (LOTR) prior to this movie, you'd notice that the Werewolf in this sequel is so similar to that in VH! Also, the Dementors whom were guarding Hogwarts was a splitting image of the Ringwraiths in LOTR ! Did they spend all that money creating Buckbeak, the Hippogrifth (which was impressive!) that they simply loaned the other villains??? Sigh..

Run Potter Run! - I don't remember much of this book, but the time travel thingy was similar to the concept in Run Lola Run. The events are repeatedly revisited, each time revealling more about the oddities you'd notice in the first sequence. Might not make much sense to you now, so just watch the movie! Hehe..

At the rate the sequels are going, hope the next installment will be way more exciting that this one was. Or at least, original! :P