Anyway.
They're not major, but I've got a few Jurassic Park ones. (***SPOILERS ALERT***) When the fences fail, Hammond orders everyone into the bunker, saying it's too unsafe outside. At the same time, they send Arnold (Samuel L Jackson) off to restart the generator - for which he has to go outside and get to the generator shed. Moments after they've all agreed it's too dangerous!
Later, no-one sees Muldoon the gamekeeper get killed, and when the survivors all reconvene to make their escape in a helicopter, NO-ONE looks around and says "Hang on - where's Muldoon, isn't he with you?"
As they're backing away from raptors in the exhibition area, they're "saved" by a T Rex that attacks the raptors. Yet the entrance to the building is a normal-sized door that seems to still be intact as they escape through it. How did the 30-foot rex squeeze through?
When they're travelling to the island in a helicopter, Hammond is sitting facing away from the direction of travel. As they approach the island he leans forward excitedly and points, exclaiming "there it is!" But the approaching island is behind him!
And even earlier, at the Montana dig, a helicopter lands and Grant, angry at the mess it's making, runs over to it to ask what's going on. The pilot points him towards the hut, so he goes there and finds Hammond already there, having apparently instantaneously teleported over from the helicopter.
And, of course, there's Hammond's amazing disappearing Scottish accent.