i dont think he did anything to the pitcher other than not notice the one inflating in another until it was too late to take action.
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I think that peristome flaring might work out, but I'm skeptical about modifying the shape of the pitcher itself. What you see done with fruits is a bit different- a plant will put a lot of energy into it's fruits because it needs them to pass along it's genes, (which is why you get things like this). With the pitchers, though, once the plant senses that something isn't right with the growing environment, it might just stay small enough to fit in the container, or abort all together. I bet you could get a big pitcher into a wine bottle or something by letting it grow and develop in there, but I really doubt you'd be able to get a wine bottle shaped Nepenthes pitcher.
"The plants you grow, end up growing you."
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I was thinking of something really simple, just a couple sheets of thin plastic cut to shape. I was originally going to suggest cardboard, but come to think of it, cardboard wouldn't fare too well in a growing environment. Just cut two somewhat matching pieces of plastic, fit them to the pitcher, and tape the edges together. Do allow some space inside for the pitcher to inflate some more if it wants to.
For shaped pitchers, just remember that the modified trap might be a little stressed and brittle. I wouldn't suggest a mold that has to be cut off. Pre-cut it first, and then tape it or attach it is some other easy-to-adjust-and-remove method.
If you shake a rain stick, you get rain. I need a hamata stick.