YMMV: Hot Tub Time Machine

  • Big Lipped Alligator Moment: Jacob is running to find his companions. Suddenly he is dancing with a girl and asking if he can text her. The girl is never seen or mentioned again.
    • The girl does show up in a deleted scene, in which she asks Jacob about his snowboard. The scene of them dancing makes a little more sense after watching the deleted scenes.
  • Critical Research Failure:
    • Motley Crue's "Home Sweet Home" was already released in 1985; a year before it would have been possible for Lou to create the song.
    • The recording shown is from a live show, it's more implied that he somehow took over the band and changed the name possibly due to his great song ideas thanks to his future knowledge.
    • A poster for Rambo 3 is seen on Blane's bedroom wall, despite the film being set over two years before Rambo 3 was released in May of 1988.
    • Poison performing at Kodiak Valley is seen as a big deal and April is covering the band for Spin Magazine, but in 1986 Poison had not yet achieved mainstream fame (that wouldn't happen until 1987).
    • Blaine references 21 Jump Street when he's arguing that the mains are Commie spies, but that didn't debut until 1987.
    • The first time Blaine and Chaz see Jacob, they act as though they've never seen a snowboard before and don't know what it is. Snowboarding has existed as a sport as far back as the 1970s, although in 1986 it was still a niche sport and most ski areas did not allow snowboarders. Still, the ski patrol personnel at Kodiak Valley would definitely know what a snowboard was.
    • The Denver Broncos' game winning drive in the AFC Championship game is lampooned despite it taking place in 1987.
    • Adam references Sweet Child O' Mine. Appetite For Destruction didn't come out until 1987, and the song itself wasn't released as a single until 1988.
  • Crosses the Line Twice: A screaming, obscene phone call to a nine year old girl becomes a character's Crowning Moment of Awesome.
    • There's also the revelation that Lou is Jacob's father.
  • Ear Worm: The nerd song
  • Family-Unfriendly Aesop: The gang using their knowledge of the future for their own personal benefit results in all of them having much better lives than they did before.
    • Well, the movie has a stronger adherence to Rule of Funny as opposed to any moral.
  • Harsher in Hindsight: Adam's quote: "One little change has a ripple effect and it effects everything else. Like a butterfly floats its wings and Tokyo explodes or there's a tsunami, in like, you know, somewhere".
  • Hilarious in Hindsight:
    • Blaine is a Type 2 Eagle Land Jerk Jock who is always freaking out about how the protagonists are secret Russian spies in their midst. Fast forward to Captain America: The Winter Soldier, where that's exactly what he is (or so it seems). And yes, you did just see that guy from The Daily Show beat the everloving shit out of the Winter Soldier.
    • In the scene parodying the Denver Broncos' game-winning drive in an AFC Championship game, Mark Jackson drops a pass due to a squirrel distracting him. In the 2011 National League Division series between the Philidelphia Phillies and the St. Louis Cardinals, play was temporarily halted because a squirrel ran onto the field. Cardinals fans gave it the nickname "Rally Squirrel" as their team went onto win the World Series that year.
  • Jerkass Woobie: Lou when he calls out Adam for being such a poor friend and never being around when he needed him. After a brief argument, Adam gives in and admits that Lou's got a point.
  • Xmeets Y : The Hangover meets Back to the Future.