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Yes, this is a mistake. I can see 6 Google results for "we are also be talking about", but four of those are from the same (possibly Chinese?) source, one also looks to be Chinese, and the remaining link is an automatically-generated transcript from a video, and therefore cannot be trusted to be correct.

The correct phrasing is "But we are also talking about...". The extra "be" is wrong because the verb "to be" is already present in the form of "are".

To answer your remaining questions: "we will also be talking about" is correct because "will" is necessary to signal that we are talking about the future. Other tenses don't use "be" like this, so "we were also be talking about" is incorrect.

You already seem to know what compound adjectives are. They can be created by various combinations: adjective+noun+ed (red-haired), noun+past participle (sun-dried), noun+noun (part-time), number+noun (5-day), adjective +noun (deep-sea). The only question is do you use a hyphen, or not. Some compound adjectives have become one word over time. How do you know? Checking the dictionary would be best.

So let's consult ODO:

1. troublemaking - derived from troublemaker
2. This one is not recognised by dictionaries - but as an alternative you could always use coach
3. well-organised