In-jokey

No amount of sartorial or physical detail, no amount of scattergun introspection, can create character (God knows how that miracle is ever accomplished) any more than the frequent, sometimes in-jokey name-dropping—Goldwater.

Source: wiktionary

There are various in-jokey things about it, the main one being the photographs heading each chapter.

Source: wiktionary

Echoes of familiar films keep popping up everywhere. So in one way (I started to say “at one level,” but pictures like this don’t have levels), “What’s Up, Doc?” is a sort of spot-the-reference game for movie buffs. This kind of thing could seem awfully arch and in-jokey if it weren’t done with such fun-sharing affection.

Source: wiktionary

‘[…]I weep or I laugh when I am writing.’ ‘Which do the reviewers do?’ ‘Fatuous last words.’ ‘That's rather in-jokey.’

Source: wiktionary