This site is hilarious!
http://www.moviemistakes.com/best.php

Of course PotC has the most mistakes that were noticed :D
http://www.moviemistakes.com/top.php

I knew about the one in "Commando" though, where a Porsche was wrecked and in the next scene it was normal again.

It's incredible to see how many mistakes are made in films. Even in a film like Lord of the Rings there is a scene where you can see a car driving in the far background! Incredible.

Errors can be tricky for any film crew. We have discussed film errors in media school and you would be surprised how difficult it is to notice them even for the people who make them. For example, a common mistake is the reverse angle error. Hitchcock and Kubrik used that error stylistically to make the viewer insecure of whats going on, but for the most part it is a big error when it comes to camera angles and can lead to misunderstandings.

How to shot a scene in a moving train? What sounds easy is so damn complex that whole books were written about the subject. One group of us was shooting a spontaneous little film on a train and it was simply a mess angle wise with the landscape moving in all directions.

Another, seemingly simple task was to film a sequence of our teacher when he arrives at the school and goes into the room. Storyboard and angle wise, everything was clear but the guy just kept changing things of his appearance during filming (wearing glasses, then wearing none etc). In the end, he looked different in every single shot.

I keep saying to myself that errors are okay as long as the film itself is involving enough and well made that you simply wont notice them.

One of the biggest bug pits ever has to be Jurassic Park with one of the biggest errors in film history. After the T-rex had Genaro for lunch, he throws the car down a cliff. Have you ever wondered about where that cliff is suddenly coming from when five minutes earlier the rex was eating a goat at the very same position? My favourite error and whenever I point that out to people, they are completely surprised how obvious this error is but yet they could not notice it. But why can such an error remain unnoticed? Because the T-rex attack is so involving and so many unusual, stunning visuals happen all at once that you just accept the sudden appearance of a cliff.

You know actually I though it was always there. But then again for the Rex to put his leg up to the cliff, guess he needed to take a BIG step.

yeah, i thought it was always there and the t-rex is that tall that he can climb over it...he isnt^^

There are many mistakes, some visible from the first time other take a while.

The Ripper in The Last Action Hero throws the axe with his left hand, except when they show it for the last time then he throws with his right apparently.
Arnold wears his watch on his right wrist during the funeral scene and later when he's with the kid at home, he wears it at his left.

Bruce Willis in Die Hard, when he jumps off the roof and screams he's on their side you can see he's actually wearing false feet.

Or his changing-colours shirt in the same film :D

But maybe back to Jurassic Park. There is a whole site dedicated to the errors in that film. It's a very entertaining read!

Check it out here

I love it! :D

I always assumed that was of crawling through narrow spaces.

Back on Jurassic Park: I have an old sticker album also revealing some nitpicks as in the early beginning of the film where Grant and Sattler are kissing each other. This is not shown in the movie. So they probably tried to stick as close as they could to the book of Michael Crichton in whice he described that Ellie was one of Grant's students and also the last sticker when they are all in the helicopter, they show Grant and the kids wide awake while in the movie they were sleeping with only Grant waking up. Could've been a promotion picture as well.

About nitpick 14 about the way they sit in the chopper. Doesn't it only look different because the camera switched sides?

Nitpick 40 was something I've always noticed. I figured it belonged for the jeep along the way.

Great site though.

Yeah those promo pics sometimes reveal a lot of scenes from the film that don't make the cut. I remember having a picture book from the lost world which had several of promo pics showing deleted scenes which later turned up as special features on the DVD.

One of the Jurassic Park trailers also had a deleted scene, namely the one where Ellie grabs the leaf she's examining before the Brachiosaurus scene. The trailers and promo pics of Alien 3 had a whole ton of deleted scenes (no big deal since 50% of that film was cut). Comics are often based on the film's scipt and therefore include deleted scenes as well.

Also I once read when the lawyer is eaten by the rex, he loses a shoe, this however is not to be seen in the final cut.

I once saw on actual footage (this happens also in the book, if I'm not mistaken) Grant gets the tail of the Rex in his face sending him through the air and makes him land on the hood of the second Explorer. That why he has that cut on his face.