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