My interpretation of this is that "roll the credits" means the text that appears after a movie, listing all the cast, movie crew members, directors, producers, screenwriters, etc. So, if you apologize and your friend says "roll the credits," this apparently means that he regards your apology to be the same as a movie production, that is, pure Hollywood fantasy, which should acknowledge, with a complete list of credits, who is responsible for producing such fantasy.
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