The Hangover Part IIGoofs

When Alan is at the hospital eating a watermelon, there are dribble stains on his lap. When he goes outside, his pants are dry.

When Phil, Doug and Stu are seated in the IHOP near the start of the movie, the amount of orange juice in Phil's glass changes between shots, even though Phil doesn't drink from it.

When Alan is playing Ms. Pac-Man (1982) and the power goes out,the ceiling fans continue to spin for a while then stop then start again between shots.

When Alan reveals how he inadvertently drugged his friends again, there is absolutely no way that a combination of muscle relaxers (most commonly Baclofen, Soma, & Flexeril) and ADHD medication (most commonly Adderall, Dexedrin, Ritalin, & Vyvanse) would have an amnesiac effect. The muscle relaxers alone by have made them loopy and pass out early, but not cause amnesia. And the amphetamine-based ADHD medication would not only have prevented any amnesiac effect, but they would've been so hyper-stimulated that they would've been in control of their faculties.

When Alan is playing Ms. Pac-Man (1982), right before the power goes out and we see the level he's on, an arrow from a mouse can be seen in the upper right corner of the screen. Arcade games are not equipped with this sort of interface.

When Alan puts a cigarette in the monkey's mouth shortly before leaving him it's visibly a hollow/fake cigarette before he lights it.

The Delta plane that is shown landing in Thailand is an Airbus A300. Delta has never had the A300 in their fleet, only the A310, which was retired in the mid 1990s.

When the crew arrives in Bangkok in the white cars, you can see a stage light in their reflections.

The protagonists travel to the wedding resort at Krabi on Thailand's west coast from Bangkok by speedboat in a relatively short time. To travel from Bangkok to Krabi by sea would involve a 1,500-mile journey through the straits of Malacca via Singapore and would have taken them at least 48 hours, non stop, with additional fuel on board.

When Phil wakes up in the sleazy hotel a Madagascar Hissing Cockroach is seen walking on the television. This particular roach is native to the island of Madagascar. Bangkok is home to Asian and Oriental cockroaches.

The Buddhist monks shown in the film are dressed in maroon/yellow robes, which are actually worn by Buddhist monks in Tibet. In Thailand, Buddhist monks wear robes which are either ocher or orange in color.

In describing the monk, the tattoo artist points out a design on the monk's arm. The tattoo artist says that the monk is from the "Chang Mai monastery, just outside of" Bangkok. Chang Mai is roughly seven hundred kilometers from Bangkok.