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1-Why did Uiharu pretending like the flowers on her head don’t exist?
It's simply a joke by the Staff, if you read the Novel she detached a hibiscus flower from her hair band and gave it to Last Order, so all theories about it being connected to her powers is false.
2-What is Uiharu’s Power?
No one knows, but apparently Toyosaki Aki and the rest of the cast were finally told by Kamachi and the producers about Uiharu’s powers.Of course despite already knowing what her ability is, they didn’t disclose any further details.
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3-Why did J.C.STAFF screw up the Time Line by letting Touma Meet Misaka before Sister Arc?
it’s obvious Touma has lost his memories, so we can assume he fails to recognize her as the girl at the Tokiwadai Festival, perhaps on the basis that Misaka looks very different in her uniform compared to when she’s dressed up.
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4-Misaka's playing the violin? Why?
Firstly Yes Misaka can play the Violin it's in the novel, but why it was introduced this early? Look Like the writers are setting up this epilogue for when Misaka teachs Uiharu to play the violin Later in Index Season 2.
5-Whats Point of seeing the Whole Tokiwadai Dorm?
The RailGun cast are interact with places that will play a significant role later in Index series.
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6-Kuroko and this pointless scene?
On the surface it may look like another pointless Joke by the Staff, but it's a reference to the Sister Arc, when Touma found the Level 6 Tree Diagram inside Misaka's Teddy Bear.
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The Teddy Bear from Episode 11 of Index Season 1