You can jump over the fence in the second level of Who Lake where there's a scout guard whom you're supposed to scare off with a skunk.

There's a place where the fence is short enough that you can jump over it by putting Max right next to it, then with Grinch jumping on Max and jumping again. You can use Max as a tool to jump slightly higher. It seems to be impossible without Max and some other fence places don't seem to work.

The place is the first corner or further (e.g. second corner) when you go straight to the scout guard and to the left.

So you can get inside the place while the scout guard is still there. (Also, an interesting thing is that the electrifying thing inside the place has the purpose of killing the flying monsters (mosquitoes) if you weren't aware and if it wasn't obvious.)

This definitely saves time if you don't care about the gift that the scout guard drops. No more little cutscene and sending Max as a skunk to scare off the guard. You could call this glitch "skunk skip".

I've even been able to jump on the house by jumping on the fence and then again. But there's nothing interesting on the house. The same for all the other houses in the second level of Who Lake. I've been able to jump on all of them by using nearby platforms such as a boat, gift, sonic scarecrow, Max.

Another fun little thing that isn't useful is that when you use the sonic scarecrow and successfully get to the other side, you can go straight and double jump on the platform where the scout guard stands. Then you can send Max to run around the other side of the door. Or you can go there as Grinch but you may be sent to the Villa level. Or you can stand very close to any Who Lake open doors and send Max to run around the other side.

Another useless fun little thing is that you can visit mayor's villa as Grinch without the scout uniform. To do this, be with the scout uniform to make the scout guard move a bit, then get rid of the scout uniform, then wear the scout uniform again, visit the scout guard again to make him move even more. Now get rid of the scout uniform again and move through the very right side of the door.

This is all at least with my PC version. Cheers.