Talking ducks

A term to indicate someone's questioning of the validity of one aspect in a fictional story is in fact overshadowed by the absurdity of the story's basic premise.

A phrase first coined when one person loudly wondered how the ducks in a Donald Duck story managed to breathe under water without any visible breathing apparatus on their diving suit, and another replied "You know you're reading a story about talking ducks, right?"

Seb: "So how did they hide a physical object in a mirror's reflection in the first Harry Potter?"

Gordon: "Dude. Talking ducks."