>>538511645
Hedgehogs can move their tails but it's subtle. Like,
>>538511847
Most of these should be okay except for the second (the one where she's hugging him with winter gear), I'm assuming that was an early issue and then Sega said to make it less obvious after that.

>>535160709
>>535160894
Official website got updated recently. It's the current version of the new official timeline: https://sonic.sega.jp/sonic.sega.jp/SonicChannel/character/worldstory/
Basically most games are in initial release orider (no surprise there) except CD is before 2 and Heroes and Shadow which are before Battle.
The games that are absent are said to be added later after the "lore team" reviews with Sega if their spots/stories need any retcons.

here comes the rose petal