It's up to Robert Langdon to piece together the clues of four missing cardinals before a bomb ignites at the Vatican. Try to track down these movie mistakes while watching "Angels and Demons".

Some sequels are just as popular as the original movie but others fall by the wayside just by being made! Let's look at some sequels that made some film fans wonder why they were made!

Sherlock Holmes and Dr. Watson are on the trail of their arch-nemesis, Professor Moriarty. Can they stop the villain and keep Europe from the brink of war? Try to find these movie mistakes and find out!

Captain Jack finds a new journey in 2011's "On Stranger Tides". This time around he must deal with the like of Blackbeard and his daughter Angelica while trying to find the fountain of youth. Here are a few movie mistakes to look for along the way!

George Reeves appeared as the man of steel in this 1951 Superman feature. Superman must save the tiny mole-men and the town that's in a state of panic. Try to use your x-ray vision to see these movie mistakes!

Barney and gang were back in this 2012 sequel. This time around it's personal as they track down the deadly Vilain. Try to find these movie mistakes!

Superman finds that some things have changed while others have remained the same when he returns to Earth after a long trip to the remnants of Krypton. Look for these movie mistakes while watching "Superman Returns" starring Brandon Routh.

Sensing the destruction of planet Krypton, Jor-El sends his young son, Kal-El to Earth where eventually grows into the superhero, Superman. Try to catch these movie mistakes while watching "Superman" starring Christopher Reeve.

Mayhem ensues when a city parking meter attendant signs up for a secret confidence building class only to have the teacher become his arch-nemesis! Try to find these movie mistakes in "School for Scoundrels".

Mr. Shoop has big plans for the summer but teaching a remedial English class in summer school isn't one of them! Have fun finding these movie mistakes in "Summer School" starring Mark Harmon.