What some reviewers on here don't understand is that this was deliberately made in a 50's style with cheesy characters and dubious special effects, to mock that style, and they give it a low rating because they didn't understand this because they are thick!
It is actually a very good Sci-Fi Comedy, Will Ferrell does his usual hamming it up in the lead role very well, Anna Friel is excellent as his gullible and innocent "fan" scientist, Danny McBride is great as the stupid "trailer trash" guy, who despite being a bit rough has good intentions and Jorma Taccone does a good Chaka under all the hair. John Boylan's voice is perfect as the 50's style domineering alien.
Direction is excellent, they keep it to the same 1950's formula almost throughout, It is well timed with great scenes and good photography, my only complaint about that is that they included a couple of music clips that came from the late 1960's, however they did seem to fit the scenes, and the film score was very good.
My favorite scenes are the after when Will Ferrell states that T-Rex has a brain the size of a Walnut and later the Intelligent T-Rex drops a giant Walnut outside the cave entrance where they are staying, where the bug sucks blood out of Will Ferrell when he is trying to play the banjo, and when they drink the juice out of a fruit which turns out to be a narcotic and 'All Along The Watchtower' by The Jimi Hendrix Experience kicks in (A song usually associated with drug taking), and at the end in the interview with Matt Lauer where Will Ferrell puts him down as a payback for an earlier interview where Matt Lauer puts down Will Ferrell.
Lighten up reviewers this is one of the best Sci-Fi comedies going.
