A reference is made to a YouTube video by Yosemitebear (http://www.youtube.com/watch?v=OQSNhk5ICTI). When the gang comes across a double rainbow, Theodore asks: "What does it mean?", Theo asks in a similar fashion to the video, at 2:44.
There is also a reference to the honey badger YouTube video uploaded by czg123. While hauling a load of bark, Alvin meets a creature and says "You're one of those honey badgers. You think you can just take whatever you want." In the video, Randall says the honey badger "just takes whatever it wants."