...and let's not forget Clint Howard. He appeared on the original series as a kid, remember?
Looks like they really have dispensed with the timeline, which I think is great. The Ferengi were first met by the Next Gen crew in the original timeline - there is no way to rationalize around this one. It's an alternate universe Trek. I love alternate universe stories as it is, so a series that is completely an alternate to the timeline we know is fascinating to me.
We also see now that T'Pol is demonstrating some very unfamiliar Vulcan traits - she lied, flat-out, to the Ferengi. She also was acting very playfully angry with the captain. Now, the way to think about this is that perhaps it's because we're seeing Vulcans as they were a couple centuries before the original series. On the other hand, though, that would only be a couple generations to the long-lived Vulcans, so I guess that really couldn't account for it. Is she half-Romulan, perhaps? Whatever the reason, I like it.
But something that can be released into the air that would knock out the entire crew? MmmmmmI don't know...wouldn't they have filtration in the air system?