I've always thought these were strange. An 'insert', what the hell does that mean? And why the screwy size? Did some guy just not have that much wall space to devote to advertising upcoming films?
Here it is, all 14x36 glorious inches of bizarreness. Another poster to have the odd color palette, which is doubly odd in this case, since it is the very same art as on the one-sheet and three-sheet. And it is not as if it was a reduced 2-color process, it is still full color, just weird colors.
Even though these were issued flat, they almost always turn up folded due to their shape - it was simply easier to fold them after use.