Galifianakis, though, is the key here. Able to smash a scene to smithereens with the simplest of lines, the hirsute comic is as unpredictable as ever, yet takes director Todd Phillips’ bait to up the stakes.
The best that can be said for the third, supposedly final chapter is that it jettisons the retracing-our-steps scenario of the 2009 original and its 2011 carbon-copy sequel. There is, in other words, no hangover in The Hangover Part III.
It's an unnecessary movie, with some funny parts and a few callbacks to the original, as if visiting Las Vegas for a bit might bring back some of the original magic. It doesn't, but at least this time it seems like they're trying. A little, at least.
The Hangover Part III plays more like a caper film — “Alan’s Eleven,” perhaps — than a comedy. While Phillips ably handles the action sequences, he and co-screenwriter Craig Mazin can’t juggle both genres in the screenplay.