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"A nod that affects the plot in some way can be considered a Chekhov's Boomerang."
"Distinct from a Call Back, as it does not actually drive any plot development,"
So if it affects the plot, which is it? What's the difference between Chekhov's Boomerang and Call-Back?
I think there needs to be a clean-up, because Continuity Nod keeps being used to refer to any kind of story arc or plot thread.
I wasn't sure where Chill Out, Scooby-Doo! went in Continuity Nod itself so I put it in Western Animation and Film.
Took this from Gilbert & Sullivan, it's not the same continuity:
Just making a note of this because I can't open a Trope Repair Shop discussion just now (and maybe someone can enlighten me).
It says: "Distinct from a Call Back, as it does not actually drive any plot development." Except that Call-Back doesn't say anything about that. And as that would be the only difference, as far as I can see, there is no difference whatsoever between these two.
From Call-Back: "More or less a Shout-Out to itself — but if that's all that it's doing, then it's a Continuity Nod; a Call Back brings back an element that is actually relevant again."
So maybe driving a plot element isn't exactly consistent, but the general idea is that a Call-Back brings back something relevant to the current story, while a Continuity Nod is just something you mention for the sake of mentioning it but doesn't go further.
If I'm understanding this right, then when the Doctor grumbles that he misses Amy when they're tied up and Clara's legs aren't long enough to reach something that would help them escape, that's a Continuity Nod. When the Doctor can't use his sonic screwdriver on a wooden cyberman because it doesn't work on wood, that's a Call-Back to the times he couldn't open a wooden door.
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