10 Small Details You Only Learn Rewatching Brooklyn Nine-Nine

Possibly the best joke involving Skully and Hitchcock - the office's impressively lazy duo, who manage to be weird enough to make the rest of the cast normal - is a joke that is actually really easy to miss the first time around.

This is because it takes place in a Halloween episode, which the show has routinely be the place for epic heists, as the precinct compete against once another with increasingly elaborate plans to steal various trophies from one another.

And so, when the third Halloween episode comes around, you're more excited to find out how they'll up the stakes of this round than anything else. So much so that you miss Skully and Hitchcock's "matching" Halloween costumes - which look as though they should have been the matching couple outfit of ketchup and mustard.

Instead the pair have somehow managed to get two mustard outfits, and don't appear to have realised that this isn't quite right. It's possibly a perfect way to define the pair without them saying a single word - and one of the funniest jokes to exist in the background of one of the show's cold opens.