Dylan is standing at Lily's window in the rain. In the first shot, his wet hair is plastered against his forehead. They cut to Lily and back to Dylan, and his forehead is now clear. When they cut back to him the third time, his wet hair is once again plastered against his forehead.
Walter Ferris worked for the U.S. Department of Agriculture, but his government vehicle's license plates were State of California Exempt plates. His vehicle should have had U.S. government license plates rather than a state government's license plates.
The movie continuously refers to the zoo's upcoming opening day as Saturday, July 7, 2010. July 7, 2010 was actually a Wednesday. The real Dartmoor Zoo that the story was based on reopened on Saturday, July 7, 2007, and this date was moved up exactly 3 years to make it more current.