This is the only map that is possible to get a Peacock to fall into the water, causing a bug where you see an illusion of a giant peacock. The peacock will still continue to go down the river even if the game is paused. This glitch is fixed in PS2 and iOS, however.
Occasionally in Viggo's Revenge the Panda that spawns next to Wayne may spawn in midair away from the ledge. Should he notice you, he will fall (to his death if he doesn't growl midway to halt his fall at the right time). If any Pandas that are on that ledge happen to fall and die from fall damage, sometimes they may glitch and freeze when they land, showing them standing rather than dead.