Movie mistakes

[Astyanax]

There are stories about massive movie mistakes but I have never seen them. For instance in Ben Hur there is supposed to be a shot of a ferrari! Also in Gladiator there is casio watch on show.

I know that in the 40 yr old virgin there is a cameraman's foot which appears in a sex scene but that is just lame.

What movie mistakes do you know of and pictures or stillshots of movies with them in? Cheers guys!