You can clip through the EOG Triggers by holding space (or whatever other key you use to open doors) in Ecwolf.

Doesn't work on DosBox btw, I checked.

Also you can go inside the triggers while holding down space, and while facing the left or right wall, release space. The camera will go through the wall behind the one you were facing, and some weeeeiiiiirrrrrdddd stuff will happen (in E1)