While I don't know if the drop is related to this incident or not, the video was wildly spread through social networks (at least in Europe) and even becoming a meme now. Even some news commented on it (local). Still no idea if it really affected the stock price, but it is 2 days now and people are still talking about it in these necks of the woods.

Did that really "cost" billions of dollars though? Isn't that just billions of _valuation_ that will not take long to recover?

Of potential stock value, not actual money. As is touted so often when talking about Bezos, Musk, and Buffet: stock value is not real money.

Drop was something like $1 per share which from ~$56 to ~$55.

Where 3 months ago Coca Cola was trading around $50, year ago Coca Cola was trading for ~$45 per share.

That was totally meaningless event, it did not drop in a way I would start buying. There is no real consequences for Coca Cola, maybe some day traders lost money selling for $56 before that event.

Take a look at the company's stock price over the last year (KO). This sort of drop is indistinguishable from random market fluctuations as far as I can tell.