There are lots of website for Hollywood movie mistakes. Perhaps the most comprehensive is
For example, the site lists 563 mistakes (the maximum) in Apocalypse Now (1979).
Mistakes are classified as thus:
mistakes that reveal the film-making process,
visible crew or equipment,
character mistakes, and
No such big work has been done for Indian films. I have been collecting mistakes, but do not have enough fir a book yet :) It is a worthy project.
Latest find, telephone pole in a film set in medieval times, Sher Khan (1962).
Now You Know!