The Egon seen in quick and obscured glimpses during the opening scene was played by Bob Gunton. For his appearance in the finale, Harold Ramis's likeness was aged and recreated with computer-generated imagery based on clips and photos from the first two movies. The images were then digitally pasted onto Gunton and Ivan Reitman, who played out the scenes. Special permission was obtained from Ramis's children to create the effect. They called the finished scene "so satisfying. They could have done him as this jolly Santa-type, but that wouldn't have been true to the character. He was in great shape, nice and trim. My dad would have loved that."

Film

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