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1. Who directed The Hangover?
Todd Phillips
Phillips had made Road Trip and Old School, and gave himself a cameo here as the man in the elevator. Jon Lucas and Scott Moore's script became the highest-grossing R-rated comedy to that point and won the Golden Globe for best comedy or musical.
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2. Which city hosts the bachelor party?
Las Vegas
The four drive in from Los Angeles in a Mercedes convertible lent by Doug's future father-in-law, Sid, played by Jeffrey Tambor, with the usual advice about what happens in Vegas. The sequel moved the same hangover to Bangkok, and the third film came back.
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3. Who plays Phil?
Bradley Cooper
Phil is a schoolteacher who pockets his students' field-trip money for the weekend and spends it being the group's self-appointed leader. Cooper was known mostly for Alias and Wedding Crashers before the part made him a leading man.
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4. Who plays Stu?
Ed Helms
Helms was Andy Bernard on The Office at the time, and he wrote the ballad Stu improvises at the piano himself. Stu has told his controlling girlfriend Melissa that the trip is to Napa Valley wine country, and she is the one he finally dumps at the wedding.
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5. Who plays Alan?
Zach Galifianakis
Alan is the bride's brother, invited along by Doug out of kindness, and his wolfpack toast on the hotel roof is where the night goes wrong, since he has dosed the Jägermeister. Galifianakis was a cult stand-up before this; the role made him the breakout.
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6. What is the missing groom's name?
Doug
Doug Billings, played by Justin Bartha, who spends the film asleep, sunburned or out of frame, since the mystery depends on his absence. Phil, among the distractors, is the one who has to phone the bride, Tracy, and stall her.
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7. What is Stu's profession?
Dentist
It gives him a professional opinion on the damage to his own mouth, and his practice is the respectable life Melissa keeps him on a leash for. Stu insists more than once that he is a doctor, and is reminded each time that he is a dentist.
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8. What is missing from Stu's mouth when he wakes up?
A front tooth
Jade tells them he pulled it out himself to prove he was a good dentist. Helms was born without that adult tooth and had his implant taken out for the shoot, so the gap is real.
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9. What animal is in the hotel bathroom?
A tiger
A real tiger, in the bathroom of the villa, discovered by Phil mid-urination. It is knocked out with a steak laced with Alan's roofies and driven to its owner's house in the Mercedes, where it wakes up early and tears the back seat apart.
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10. Who owns that animal?
Mike Tyson
Tyson plays himself, punches Alan in the face and sings along to Phil Collins's In the Air Tonight, drum fill included. Floyd Mayweather, among the distractors, is the other boxer with a Vegas connection; Criss Angel and Wayne Newton are Strip fixtures.
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11. What name does Alan give the baby they find?
Carlos
The baby's real name is Tyler, and they trace his mother through the wedding chapel's paperwork. Alan carries him in a chest harness, insists on Carlos and fits him with sunglasses for the walk down the Strip.
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12. Which hotel do the four check into?
Caesars Palace
They take a villa on Stu's credit card, after Alan asks the desk clerk whether Caesar actually lived there. The chicken, the tiger and the baby are all waiting in it by morning, along with a smoldering armchair and no sign of Doug.
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13. What vehicle have they accidentally acquired?
A police cruiser
The valet brings it round in place of the Mercedes, and Phil drives it down the Strip with Alan hanging out the window. Returning it means a deal with Officer Franklin, played by Rob Riggle, that involves his stun gun and a class of schoolchildren.
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14. What is the name of the woman Stu married during the night?
Jade
Jade is a stripper and single mother played by Heather Graham, and the chapel owner, Eddie, happily sells the boys the photos of the ceremony. Stu gave her his grandmother's ring, meant for Melissa; the marriage is annulled, and he asks her out anyway.
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15. Where is Doug eventually found?
On the hotel roof
Phil and Stu had carried him up there, mattress and all, as a prank in the night, and forgot. The mattress impaled on the statue below is the clue they misread; Doug has been baking in the sun for a day, and they get him to the wedding with minutes to spare.