In The Hangover Part 2, it is Stu who realizes the location of the the missing party member; this time it is only through an internal dialogue and a quick series of flashbacks that returns his memory allowing him to figure out the mystery. In my opinion, it is a cheap fix and an unoriginal way to solve a gaping hole in the story-how do we end this thing?
The Hangover Part 2 does add two new and interesting plot-driving characters: a drug dealing monkey (a stolen animal similar to the tiger in Part 1), and Kingsley, played by Paul Giamatti, a pseudo-gangster who replaces Mr. Chow as the movie's lead gangster and kidnapper.
The move is rated R, and contains both gross humor, adult language and themes, and soem pretty wild scenes of violence, drug use, sex, nudity, and the discharge of bodily fluids.
The sequel, like the first movie, was directed by Todd Phillips, who usually makes cameos in his films, though I did not notice him in this one. Bryan Callen, who plays the Vegas wedding chapel owner in the first film, here play Samir, a swarthy Thailand strip club owner and part time gangster. Callen is a great character actor, and Samir is a funny role.
If you can catch The Hangover Part 2 at a second-run movie theater, and pay no more than $1.50 for the ticket, you'll get some value for your money. Otherwise, I'd recommend waiting until the movie is available through Netflix your premium cable subscription.