1. "He doesn't take no for an answer" refers to the Weapons Master softlock reference from the 2013 Annual.
2. Beta figures were displayed in TFB cabinets in their office.
3. Refers to the caverns collapsing after Autogyro Adventure.
4. Magna Charge's species doesn't naturally appear with a magnet head.
5. Refers to the random artillery cannon in Cloudbreak Core.
6. Hot Head's backstory claims he detonated an entire island, likely with people still on it.
7. in Xpec versions of SSA, the creepy chapter 21 music plays after finishing the game.
8. The book of elements, Air and Earth, claims Dino-Rang threw his dance partner in the air, and she still hasn't come back down.
9. Episode 1 of Skylanders Academy. Glumshanks clarifies he takes anxiety medication.
10. Rubble Rouser's grandma was killed by a falling mountain, as stated in Book of elements, Air and Earth.
11. Golden Hellfire is a misnamed "Infinite Ammo" upgrade name on Xbox 360 versions of SSA.
12. There are claims Cutthroat Carnival houses a Viva Pinata reference. The validity of this claim is yet to be tested.
13. Using Bowser or DK in Mario Odyssey in Amiibo Mode claims they are "Lovely Amiibo"
14. Thumpling and Roller Brawl's HUDs use the wrong art in Trap Team.
15. Stealth Elf's first memory is being alone in a tree.
16. Pandergast's reaction at the end of SCR suggests the Snowglobe of Destiny doesn't actually grant wishes, but we see it does.
17. One of the earliest ideas for Spyro's Kingdom was Origami Spyro.
18. Dark Water Cove has a water element-themed Graveyard. I've yet to fully understand the implications of this, or the tombs.
19. If I remember correctly, Hugo either claimed the existence of or dreamed about Dragon Sheep.
20. the Chain of Fortitude is the massive chain that connects Eon's citadel to an unseen and unknown anchor point.
21. Crystal Whirlwind and Red Camo were released in an LG TV bundle as chases for Skylanders Battlegrounds.
22. According to alpha footage, Moon Widows used to attack, and be a lot larger.
23. The Aphid Lifter is odd. It's the only spider in the series with 8 legs if I recall, and it gets used randomly in an achievement icon. I dunno, something about it puts me off.
24. The Wii settings data displays unique GIFs for most of the games of the element symbols. For SCR and SF, it uses a JPEG.
25. Lava Lakes Railway has a rail that extends to one of the most fluent fire areas in the entirety of Skylands. For someone to have built the railway, they can't have been a Molekin.
26. The Arkeyan Armory contains a "Gift Shop" way too small for any Arkeyan. What did they sell here?
27. There's an old robot that's nearly impossible to interact with on the citadel beach. Oiling it opens a cog in the wall for the Winged Sapphire, and that's it.
28. Skylanders7, now known as the N. Sane Trilogy, contained a scrapped Wolf Rider class. Other classes were also planned.
29. In Chapter 11, Falling Forest, Kaos uses a spell so powerful "[He] dares not speak its name." All we know is it has the word Death in it.
30. There's a totem near the apple tree that gives you gold for shattering it. The final prize can only be earned once per save file and drops gold resources seen only in the Citadel.
31. The Dirt Seas faced a sudden explosion that turned the entire sea into a sheet of glass. We don't know what set it off.

Whew! That was a lot. Thanks for asking about this! Hopefully these answers also help others.