@~Kilza~ hit the nail on the head with his explanation. We won't be calculating how many of each egg was redeemed until the very end of the event. It's not related to the fastest 100 people to find it, but rather how many find it in total.
This is correct: misspellings will not be accepted. Variations might refer to something like the difference between a singular or a plural ("collectible" vs "collectibles") or a regional difference ("favorite" vs "favourite"). The answer is still technically correct in both of these instances. A word spelled incorrectly is technically incorrect, so will not be accepted. If you're unsure of the spelling of the word you are submitting please take the time to Google it to verify. I often just write "[word] definition" and hit enter when I'm unsure on the spelling or meaning of a word.