Other mistake: Due to the gait of the T-Rex, its head moves rather significantly when it walks as seen throughout the movie. However when it approaches Dr. Marshall with the laser in its teeth, the laser is steady and able to pinpoint a line up his head in a very steady manner which would not have been possible.
Land of the Lost (2009)
1 other mistake
Directed by: Brad Silberling
Starring: Will Ferrell, Anna Friel, Danny McBride, Jorma Taccone
Character mistake: In the scene where Rick Marshall is playing the Banjo, he says he has been "doing some thinking with just him and the old four string". His banjo has five strings and you can see the five strings when he lays the banjo down.
Dr. Rick Marshall: If you don't make it, it's your own damn "vault." That's a bitch slap of truth right there.
Question: Has it been explained how all those animals (and primates) ended their lives in the tyrannosaurus rex's lair? Did all of them get there by the sand trap(s)? If so, who re-hid them after they had been walked into? Perhaps the lair was used as sacrificial grounds or execution by the primates?