Sequel Movie Mistakes
Let's be honest, sequels rarely live up to their popular predecessors.

With a boatload of cash on the line, who can blame classics such as "Home Alone" and "Superman" for spawning inferior follow-ups? Still, that's no excuse for some obvious blunders. While not every mistake is cringe-worthy, the "High School Musical 2" goof is especially painful and really makes you wonder who wasn't paying attention.

Here are 13 "oops" moments from blockbuster sequels. As usual, all photos are courtesy of MovieMistakes.