Movie Trivia

Will be Bradley Cooper and Justin Bartha's third film together as they starred in both New York, I Love You (2009) and best friends in Failure to Launch (2006).

During filming in Las Vegas, one of the Mercedes (a very beat up and distinctive one) was stolen from the lot where the vehicles were being kept. The next day the production was filming driving sequences and traffic was being held up by the local police. A production person noticed that a very distinctive Mercedes was part of the cars being held, the police were told, the driver was arrested and the car was recovered.

Three sets of twins and a dummy were used to portray the baby.

During the first scene involving Las Vegas, the Danzig song "Thirteen" is played. The room number the characters stay in is room "2452", which added together separately equals "13". Thirteen is a very unlucky number in Las Vegas, hence the movie's entire plot.

One of the songs from the movie is "Can't Tell Me Nothing" by Kanye West. One of the stars, Zach Galifianakis was actually paid by West to make an alternative music video for the song.

No effects or prosthetics were created for Stu's missing tooth. Actor Ed Helms never had an adult incisor grow, and his fake incisor was taken out for the parts of filming where Stu's tooth is missing.

Director Cameo: [Todd Phillips] A guy making out with a woman in an elevator at the hotel.

Plans for a sequel had already been made before this film was even in theaters.

Director Trademark: [Todd Phillips] [band] The foul-mouthed band featured near the end of the movie is the "Dan Band", the same band from Frank's wedding in the movie Old School (2003) and Vince Vaughn's daughters' Bat Mitzvah in Starsky and Hutch.

When Zach Galifianakis (Alan) makes the joke about him not being allowed near schools or a Chuck E. Cheese, that is a direct reference to one of his staple jokes in his stand up: "When you look like I do, it's hard to get a table for one at Chuck E. Cheese."

According to Celena Haas (Caesars Palace Director of Public Relations), the suite the characters stayed at was modeled after two of the resort's luxurious suites in its Forum Tower: a well-appointed penthouse and the so-called "Rain Man suite," located on the 68th and 69th floors of the Forum Tower.

At one point, Officer Franklin (Rob Riggle) refers to Alan as "Fat Jesus." This is a reference to a Zach Galifianakis joke from his "Comedy Central Presents" (1998), in which he claims, "I look like Fat Jesus...not Phat Jesus."

Todd Phillips waived his usual salary and received part ownership of the film instead. In an interview with Howard Stern, Phillips said that due to the film's box-office success "this is [his] Star Wars (1977)."

Due to MPAA sanctions which make showing a real erect penis an automatic NC-17 rating, the erect penis shown at the end of the film is a fake penis prop.

Lindsay Lohan was offered the part of the stripper, Jade in the movie but turned it down. She did not like the script and thought the movie would bomb. She later admitted to regretting the decision. Heather Graham was given the role instead.

SPOILER: According to Bradley Cooper, whilst giving a speech at a Toronto screening: "the people in Las Vegas never even noticed [a] movie was being filmed." He said that he had tiger scratches on his neck, all bloodied, and Justin Bartha was beet red, and nobody noticed, or even stopped to double-take.