Kill the sheep that breathes heavily.
Next push it under the ships exhaust (in the mud)
Then go up to Dan as a dog and bark allot whilst on the glass this should cause him to turn the engine on. This will burn the sheep revealing the souvenir!
go to snow joke (first level of ice) and go to where the big computer is go up to the rabbit and kill it then go back to the begining and try to hop up the platform at the lowest point (the thing at the border of the level) once on jump off the stage (not the platform) but into the black place and you should be able to hop around but not get out
on Stinky Sewers, kill everybody, and use the rat to push the dog to the king's room.now, as the dog, jump up on the toilet. now u may be able to jump into the wall. WaRnInG!!!! once u go in, you don't come out!!!!
why is this so? well, this is obviously a low budget game. they have to program in boundaries in box statements. it appears that in these odd circumstances, they were in too much of a hurry to program the sky in all places. this is also what happens on Fat bear mountain, so the trophy is A MIRAGE. just beat the level.