** FILE ** From left, Ken Jeong, Kevin James and Rosario Dawson co-star in "Zookeeper," which is unlikely to make anyone forget Dr. Doolittle. (Columbia Pictures)
"The Hangover Part II" features (from left) Bradley Cooper, Ken Jeong, Ed Helms and Zach Galifianakis. The movie suffers due to a perceived need to top the 2009 original by introducing heightened versions of that film's basic elements.