What Was the Opening Title Easter Egg in Only Murders in the Building Season 4 Episode 6, “Blow-Up”?

What Was the Opening Title Easter Egg in Only Murders in the Building Season 4 Episode 6, “Blow-Up”?
Brian shares the opening title Easter Eggs from the sixth episode of the fourth season of the hit Hulu TV series, Only Murders in the Building, "Blow-Up."