Originally Posted by nostalgia
That looks like very alive yeast and a happy fermentation. Hydrating early won't hurt anything at all. Adding the dried DME was unnecessary, but also likely won't hurt anything.
Your story sounds like a couple of my first few batches
Nothing you did is fatal, honestly the biggest problem with the long cooling time is that it's a pain in the ass for you (there could be some effects on your beer too, but it's no biggie, don't sweat it). I got myself a wort chiller not so much for my beer, but so I could go to bed sooner!
That looks like about as much kraeusen as I would expect after 18 hours or however long you said it's been. You're doing great!