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How about casting solely for the purpose of using someone's name in the credits to refer to some famous person with the same name, where that person has some thematic relationship to the work? I suspect that was done for the TV movie of "The Lathe of Heaven" when they cast a Jane Roberts in a bit part. Another Jane Roberts was the author of the Seth books, which would have a thematic relationship to "The Lathe of Heaven".
If this is done, this is clearly a type of Casting Gag, but not one fitting the specific description of any subtype, nor actually fitting the description of the general type. That is, it fits in spirit but not in letter without some broadening of the general description.
A lot of movie examples are in fact cases of Actor Allusion. I wonder if moving them to the proper page and deleting them from here would be considered a vandalism.
Another example from "Cold Case"...
In an episode called "Willcommen" singer Adam Pascal portrays a shy taxi driver auditioning for a role with a community theatre production of "Cabaret"... Adam Pascal is actually a rather well-known in musical theatre circles actor/singer in the musical "Rent."
Can we say... you look surprisingly like someone famous!
I read the description and though I understood it, then the examples left me doubtful before the article scrolled off the page. What is this about again, and what are these things doing here?
What!? No real life examples?
Is there a trope for "casting actor X in the role of character Y, but everybody knows that they are really casting actor X"?
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How well does it match the trope?