When the two Hippo cops crashes into the docks several apples are rolling towards them and they eat them. This is a reference to the game "Hungry Hungry Hippos" where hippos eat different colored balls in the same way.
During a chase scene, a lion chef is seen making ratatouille only to have his hat knocked off revealing a rat pulling on his mane, a reference to Disney/Pixar's 'Ratatouille.'
The chase in the snow-covered hedge maze at the end of the film is a tribute to a similar sequence in Shining (1980). A snippet of that film's score even plays over the establishing shot of the maze.
When visiting Gary's old home a list of family members can be seen on the wall, they are named, Larry, Barry, Gary and Harry.
Jesús, the basilisk lizard. Basilisk lizards are also known as "Jesus lizards" because of their ability to run on water.