History ShoutOut / RiversOfLondon

* When Isis offers to do Peter a favour, her husband Oxley suggests she not [[TheLordOfTheRings meddle in the affairs of wizards.]]

** 'Reuel' is one of J.R.R.Tolkien's middle names.

* At one point Postmartin arrives at the Folly and comments "My, my, my. What a mess", to which Peter immediately responds "It's a circus", both quotes from ''Film/TheFugitive''. Postmartin then says loves the classics, but somehow missed [[Series/TheFugitive the original TV series]].

* At one point Chelsea and Olympia learn to use a bow, one of them hits the bull's eye and exclaims "Eat your heart out, [[Literature/TheHungerGames Katniss Everdeen!]]".

* The graffiti artist is interrupted in the middle of writing "[[Film/BillAndTed Be Excellent To Each Other]]".

* There are several references to ''Series/DoctorWho'' throughout the series. Given Aaronovitch's writing history,[[note]]He wrote two stories for the original series - 1988's ''Remembrance of the Daleks'' and 1989's ''Battlefield'', as well as several Literature/VirginNewAdventures and a [[AudioPlay/BigFinishDoctorWho Big Finish]] Lost Story he would have written for the show's unproduced 1990 season[[/note]] this probably counts as an InJoke.

*** Peter compares [[NoodleIncident the thing that happened at Kew Gardens]] to the Krynoid from [[Recap/DoctorWhoS13E6TheSeedsOfDoom "The Seeds of Doom"]], saying that using said comparison in his report probably didn't help the trouble he got into.

** ''Amongst Our Weapons'': Seawoll again; it turns out he spent his childhood playing at ''Doctor Who'', because Brook refers to "all those Daleks and Drashigs and other monsters".

* The bent copper murder victim was [Literature/GoodOmens Greasy Johnson]].

* During a confrontation on a ClockTower, with a thunderstorm in the distance, he says that all that's missing is [[Film/BackToTheFuture a DeLorean]].

* In "A Rare Book of Cunning Device", the decor in the basement of the British Library makes Peter feel like he's in a level of ''VideoGame/MirrorsEdge''. Also, upon realizing they're dealing with a "book robot", Peter muses that it sounds a bit ''WesternAnimation/DespicableMe'' for his tastes.

** The eponymous granny says that when her powers manifested she thought she was psychic rather than magic because it reminded her of ''Film/{{Carrie}}''.

* Peter mentions his Dr Marten's shoes "retain some of that [[{{Literature/A Clockwork Orange}} horrorshow]] goodness for kicking".

* Several to Franchise/TheHitchhikersGuideToTheGalaxy:

* The job offer Abigail gets at the end includes a tongue-in-cheek promise of "excitement and adventure and really wild things", a quote from ''Radio/TheHitchhikersGuideToTheGalaxy''.

* Peter describes the inside of a library decorated in silver and red as "like a particularly creepy level of ''VideoGame/SystemShock2''".

* The job offer Abigail gets at the end includes a tounge-in-cheek promise of "excitement and adventure and really wild things", a quote from ''Radio/TheHitchhikersGuideToTheGalaxy''.

!!''Monday, Monday''
* Peter uses his knowledge of ''WesternAnimation/AvatarTheLastAirbender'' and ''Anime/AttackOnTitan'' to get an underage suspect to open up.
--> '''Peter:''' Score one for [[GentleTouchVsFirmHand good cop/nerd cop.]]
* Foxglove is working on a painting in the style of Creator/RoyLichtenstein.
* Abigail takes Foxglove to King's Cross Station so she can do a picture of Abigail going to [[Franchise/HarryPotter Hogwarts]].
* Stephanopoulos's rooster is named [[Literature/ReaperMan Cyril]].

* In explaining the different methods by which someone can get caught up on colleagues' progress in an investigation, Peter's example of the most concise - meeting them at the pub, where they'll tell you as fast as possible so they can quit thinking about work and resume drinking - summarizes the search for video of Gallagher as follows:
--> "We've gone over every bit of CCTV footage in the area, and it's as if the fucker beamed down from the Starship ''[[Franchise/StarTrek Enterprise]]''."

** ''Amongst Our Weapons'': Seawoll again; it turns out he spent his childhood playing "Daleks and Drashigs".

* When Beverley encourages Peter to let off a little steam and release his pent-up anger, she says she's not telling him "[[ComicBook/IncredibleHulk to turn green and go on a rampage]]".

* In "A Rare Book of Cunning Device", the decor in the basement of the British Library makes Peter feel like he's in a level of ''VideoGame/MirrorsEdge''.

* Stephanopoulos's Rooster is named [[Literature/ReaperMan Cyril]].

* Peter calls the child goddess of the Glossop Brook [[ComicStrip/DennisTheMenaceUS Dennis the Glossop]] at one point.