- Complete Monster: Lord Roderick, the chief advisor of the King of Cloister, schemes for the throne and much more himself. Utterly self-aware of his own case of Chronic Backstabbing Disorder and reveling in every moment of it, Roderick has a monk who steals the magic beans he procures tortured before personally murdering him; cuts the safety harness keeping most of the men in his own search party from falling to their deaths when he's climbing the beanstalk; extorts the last bean out of Jack by threatening his life and his uncle's; throws another one of his loyal companions to his death; and, finally ceasing his long trail of betrayal, enslaves the giants of Gantua and commands them to eat his own remaining comrades. With an army of giants, Roderick plans to lay waste to the lower world, conquering first his own kingdom and then the rest of the world.
- Hilarious in Hindsight: Aside from starring in this film as the king, Ian McShane also appeared as a dwarf in another fairy tale based movie, Snow White and the Huntsman.
- McShane would also appear as a man who played a part in hunting giants in the latest film adaptation of ''Hellboy''.
- The sequel hook for the film is this in that it suggests a modern day version of the Jack and the Beanstalk tale which was done in the obscure 90s family film Beanstalk (and the somewhat darker Jack and the Beanstalk: The Real Story, which made Jack the villain of his interaction with the giant).
- Narm: One major criticism of the film is the unnecessary presence of General Fallon's second head, which detracts from more serious moments when it's babbling baby-talk or looking around absent-mindedly while the main head is being intimidating.
- Nausea Fuel: It is established that the giants are fairly disgusting creatures, scratching their butts, along with several fart and belching jokes sprinkled throughout. One is also shown picking its nose...and then eating the booger he picks out. Mind you this giant is the chef.
- Portmanteau Couple Name: Jack/Elmont is given the the highly clever name of Elmonterey Jack.
- Special Effects Failure: While the effects are decent, they're not up to the quality of the $195 million spent. Though that may have been due to Digital Domain's bankruptcy during production.
- Visual Effects of Awesome: While the digital giants are quite good, the effects that brought the beanstalk sequences to life are pretty darn impressive.
- What Do You Mean, It's Not for Kids?: It's based on a fairy tale, so it must be okay for young children, right? Dead wrong. Discretion shots aside, there are some pretty brutal (and often highly original) on-screen deaths.
YMMV / Jack the Giant Slayer