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Seifall is correct in as much as the salute was executed in the way that suited Alto's character... Whenever a character is created, in order to make them even slightly believable, you need to set up a visual language... ques that tell you you're seeing that person and they are consistent in their mannerisms. The "three fingered salute" was that way because that's how Alto tips his hat to others... its a minor trademark for him. But no, it's not a reference to anything further back in the series other than keeping the character the same from scene to scene.
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