Yep some are wrong...
My copy of Lawrence of Arabia is described on the back of the DVD as being 2.20:1, when it's nearer to 2.157:1.
And Dune, which is described on the back of the DVD as being 2.35:1, when it's nearer to 2.30:1.
Which both equate to being around 10 vertical pixels off target... quite a bit
Cheers