 Stollard wished the butterflies to be as realistic as possible , and modeled them after mounted butterfly specimens his team studied . The butterflies were computer generated animations and added later in post @-@ production . To create the illusion of Young falling through the window , the visual effects crew placed small explosive charges on the tempered glass window ; Slocum 's <unk> <unk> Burke then jumped through while they triggered the glass to explode . Two cameras , one high and one profile , were positioned to shoot the fall , and were <unk> together later into a matte painting of the World Trade Building . The fall was filmed multiple times with a green screen , with the <unk> falling on a cushion . While on @-@ set , Toye explained of the shoot , " with all the pieces put together with the visual effects and with the performance we got with our actor Ptolemy , it 's going to be fabulous . " A crewman believed that the addition of music to Young 's fall made the scene " far more elegant and more of a statement . " In a December 2012 interview , actress <unk> Nicole stated that she developed a fear of butterflies as a result of this episode . 
