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Hot Tub Time Machine (2010) Poster

Trivia

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In an interview, John Cusack stated that he made his decision to join the cast of this film almost entirely based off of the title.
Craig Robinson came up with the Michael Jackson joke used on the trailer, as well as the "It must be some kind of hot tub time machine" line that he deadpans directly into the camera.
When the boys travel back in time and open their suitcases to find Adam's filled with drugs, Jacob asks "Who are you, Hunter S. Thompson?" John Cusack was actually very good friends with Hunter S. Thompson. Cusack was also considered to play Hunter S. Thompson aka Raoul Duke, in the film Fear and Loathing in Las Vegas (1998), (before the role went to Johnny Depp), Most likely an in joke to when he replies "I thought I was."
When the guys first realize they're in the 80's and images are flashing up on the TV, there is one shot of Chevy Chase from his appearance in a Paul Simon music video "You Can Call me Al" from 1986 which is the year the movie is set. Chase plays the repair man in the movie.
Months after the film had wrapped principal photography, it was decided that additional scenes were needed. The scenes with William Zabka were filmed just a few months before the film was released.
One of the clips shown on TV, inside the ski lodge, is a Saturday Night Live sketch by Eddie Murphy. The classic skit has Murphy looking, singing and acting just like the legendary James Brown getting into his hot tub.
During the sex scene between Lou and Kelly, Lou shouts "Droppin' Loads!!" upon orgasm. This is a reference to porn star Nick Manning's signature catchphrase.
When they're on the mountain, a guy skis past talking on a cell phone and asks "where's my $2.00?", a reference to the deranged bike riding paperboy in Better Off Dead... (1985), starring John Cusack
In the movie Blaine is a patriot fighting against perceived communists. In real life Sebastian Stan was born in Romania when it was under communist rule.
During the closing credits, the last entry under the cast says "and introducing William Zabka". This is obviously an inside joke as Zabka has been acting since the early 1980s.
Crispin Glover, who plays the bellhop at the hotel, also starred as George McFly in Back to the Future (1985), another time-traveling movie that takes place partially in the mid-1980s. Additionally, he lost his arm in an accident whose cause isn't shown until the end, just like the cause of his son Marty's hand injury isn't explained until the end of Back to the Future III.
After arriving in the past, John Cusack's character pulls a Fishbone T-shirt from his suitcase. Cusack is a known fan of the band, and there have been references to them in several of his other films.
The band Poison was portrayed in the movie by a Poison tribute band from Phoenix, Arizona that went by the name of Unskinny Bop.
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When the group first come down the mountain after confrontation with ski patrol they start to realize something strange is happening. After the man passes talking about being on a mountain on his cell phone, you hear somebody say "A bet's a bet I want my 2 dollars!" This is a reference to John Cusack's "Better off Dead". Through out the movie the paper boy continuously chases down John Cusack yelling for his 2 dollars.
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Writers Sean Anders and John Morris were originally slated to direct until they were replaced by Steve Pink, a personal friend of John Cusack.
The long brown coat that Adam wears near the end is just like the one John Cusack's character wears in the famous boom box scene from Say Anything (1989).
Jacob makes a reference to the Stephen King novel The Shining. "I'm gonna make a prediction right now. One of us is gonna start writing a novel, and then we all get snowed in, and then Lou's gonna axe murder all of us." John Cusack previously starred in the movie 1408, which was based on a short story by Stephen King.
United Artists' last film to be distributed by Metro-Goldwyn-Mayer.
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Shipped to theaters under the title "Bulldogs".
When the group first meets Blaine, Jacob says "hey look, it's the douchebag from karate kid." Rick who was betting against Lou in the bar was played by William Zabka, who was the rival of Ralph Macchio in the first karate kid movie.
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The hotel room the guys stay at is room 420.
In 2005, Harvey Birdman episode "Beyond the Valley of the Dinosaurs" had a hot tub in which characters where sucked back in time through a hot tub time portal.
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Towards the end of the movie, a credit/debit card is shown close up - a blue Capitol Federal Savings card. That is a Kansas bank based in Topeka, Kansas.
At 49 minutes in Blaina mentions to chaz about the lads being 21 jump street type. They went back to 1986. 21 jump street wasn't released until 1987 starring Johnny Depp
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If you listen to the commentary of the nature documentary Adam is watching at the beginning of the film, it foreshadows Lou puking on the squirrel after the hot tub party.
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Spoilers 

The trivia items below may give away important plot points.

According to Clark Duke, it was his idea for his character Jacob to travel back in time and find out Lou was his father.
As a fun inclusion for the fans, the light-blue Chevy pickup with the "sidestep" bed is just like the one the kids in Red Dawn (1984) used to escape into the woods, and Red Dawn is also the movie that inspires Blaine, the chief antagonist, to believe that the time travelers might actually be some kind of "21 Jump street communist spy battalion type dudes."
There are many anachronisms and plot holes in the movie. For example, when the guys get back to 2010, Lou shouldn't be there. He never went back and therefore would be in an endless cycle. These aren't necessarily goofs. The writers seem to be playing fast and loose with the 80's, and obviously don't care about holes for the sake of comedy.
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Goofs | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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