!!The TV series:
* CrowningMusicOfAwesome: Earle Hagen's theme and episode scores (as well as averting CaliforniaDoubling, the series eschewed tracking in music - [[Series/TheAndyGriffithShow like other]] [[Series/GomerPyleUSMC shows from ]] [[Series/TheDickVanDykeShow the same producers]], every episode had an original score, which was by no means common for 1960s TV).

!!The picture books:
* GrowingTheBeard: The first book in the series was arguably less imaginative than later entries, as most of the images featured a spattering of random objects over a two-dimensional space. In subsequent books, the photographs often contained entire miniature worlds, which, besides having substantially greater appeal for the imagination, used depth and perspective to heighten the challenge.
* SurpriseDifficulty: Some people might be surprised that, in spite of the target audience being children, the riddles can be shockingly difficult and even stump many of the parents who were trying to solve the riddles with their kids, particularly the ones involving homonyms, as noted by WebOriginal/{{Brutalmoose}}.
* VisualEffectsOfAwesome: Yes, in a children's book series. The grand majority of the books were written before Walter Wick moved to digital photography...which means that, yes, ''every single picture was completely real and done by hand, with zero photo editing.'' He even has a series of behind the scenes features on his web site detailing how he put together quite a few of the harder-to-explain pictures.

!!The video games:
* CreepyAwesome: Skelly, the living skeleton from ''Spooky Mansion'', speaks [[RhymesOnADime entirely in rhyme]], has a big, spooky house, created a series of riddles for the player to solve before being able to leave, and made a machine to create ghosts from simple objects.
* CreepyCute: The ghosts from ''Spooky Mansion''. Tick-Tock and Meow in particular.
* GrowingTheBeard: ''Spooky Mansion'' shaped the games into being themed like the books after ''I Spy'', ''I Spy Junior'', and ''I Spy School Days''. ''Treasure Hunt'' then went onto to format the "[[RuleOfThree three adventures]]" gameplay.
* HilariousInHindsight: Skelly's voice sounds quite a bit like [[WesternAnimation/StevenUniverse Peridot's]].
* ItsShortSoItSucks: The original ''Spooky Mansion'' spurred a lot of complaints of this, as evidenced by Amazon reviews. The ''Deluxe'' version alleviated this heavily by giving it an overhaul described on the main page; given that most people seem to remember it a bit more fondly than the original, it probably worked.
* MostWonderfulSound:
** Several of the sound effects in the games are so jovial. Especially after you've looked all over for one item.
** From ''Fantasy'', [[spoiler: "6...firing rocket."]]
** Skelly's "Hoo-hoo! A new record!" from ''Spooky Mansion''.
* NightmareFuel: The OminousPipeOrgan from the first ending in ''Spooky Mansion Deluxe''.
* UglyCute:
** Critter, the ghost made from a snake, a frog, two flies, and an eyeball. No doubt he's made from creepy ingredients, but he looks so cute with his big eye.
** The friendly aliens from ''I Spy Fantasy'', also with big, innocent eyes.
* ViewerGenderConfusion: Skelly from ''Spooky Mansion'' is referred to with male pronouns on the CD case's description and on Scholastic's website, but is often mistaken for a girl due to his androgynous voice.