It appears that the option to use Windfall production powers-- such as from activating Produce or from Terraforming Specialists-- is tied to the "undo" button.

Undo is a good thing to allow, since choices do matter, but I believe an additional button to "skip windfall production" needs to be applied for each.

This stemmed from the game listed in this report.

if you look at Move 83 and 84 in the game listed, you'll see I had to undo my move to produce an Alien good on Alien Oort Cloud Factory. This was after looking at the UI confused because I had three Windfall production capabilities in play: the one from activating Produce, one from Alien Coalition, and one from Terraforming Specialists.

I wanted AOCF to have an Alien good on it for use with Galactic Exchange in a future Trade/Consume phase, but I had to hit Undo.

It wasn't exactly clear what undo would do, particularly since I only needed to use one of the three Windfall production powers (and definitely not the one from Uplift Coalition, since that would have produced a superfluous Green good on AOCF).

I just feel the Windfall production capabilities need a bit of a better UI flow... in the case of multiple Windfall producing powers, perhaps treat it like it works in the Consume phase, where the dialogue box allows you to choose a Consume power to activate, and go from there.

Now that I'm thinking back on it (I haven't watched the replay yet), I suspect this is already an option? I think the iconography of the Windfall powers threw me for some reason. You may tell me this already, but I suspect I just had a hard time parsing the UI in a context in which I don't normally see it.

Yup... just watched the replay... disregard this report.