OoP: Red Flags/Red Herrings

[Milz]

I posted a Red Flag/Red Herring list on the HPFGU-main board waaaay 
back in May 2001

Here's a partial RF/RH list (so far) for OoP
 
1. Chapter 5 Electric Phenomenon (C5-EP)

Uncle Vernon grabs Harry but lets go due to what seems to be an 
electric current running through Harry's body.

Is the C5-EP a yet-to-be-identified curse/hex/jinx/charm? Is it an 
established curse/hex/jinx/charm or is it something Harry has 
formulated himself? 

OR is the C5-EP the manifestation of Lily's Protection?

At any rate, Harry seems to have demonstrated it before, specifically 
in PS/SS Battle with Quirrell. 

Will the C5-EP be used in defeating Voldemort?

2. Neville's mum's candy wrappers

Any significance in this? Is this too some kind of protection spell? 

3. Okay, this was on the list from May 2001, Opals. Cursed opal 
necklace in CoS, Madame Maxime's opal necklace (GoF), the bottle with 
a large opal on the stopper in the Black House (OoP)

The opal references might be a herring (most likely IS a herring). 
But they seem to be mentioned more that other precious stones in the 
series....

4. Founder's memorabilia

Slytherin left his basilisk. Gryffindor left his hat (the Sorting 
Hat) and his sword. Did Ravenclaw and Hufflepuff leave anything 
behind and will they be significant in defeating Voldemort.

5. The Hogwart's motto 

Is it a cute motto or is it an important clue?

~Milz