A puzzle, or a reminder to review the site guidelines?

I love puzzles. You never know exactly what tricks the puzzle maker will throw at you. Well, this is a fairly simple puzzle.

Exactly five giveaways hidden here. Codes for the giveaways, the five letter/number combo are hidden waiting to be found. Knowing that a capital I is sometimes indistinguishable from a lower L, I assure you there are no lower case Ls in the codes. 6 hints will be given at the appropriate times. play on, my friends!

As I promised above, my fifth and final clue:
A member of the Clupeidae family has been inserted into this puzzle. I made it bright red, so it should be hard to miss. That should lead you straight to the "well hidden" giveaway.

View attached image.