I edited my earlier comment because I decided that Isaac probably threw away what's left of the action figure rather than what's left of the tar baby.
With a cliffhanger, you usually know what happened and more importantly you know what you're afraid will happen. As you pointed out, we don't know those things, so it's not a cliffhanger.
In this case, we see that Isaac is about to ride off in a cart with the wonky wrench. We don't know if it's a good thing or a bad thing. If we don't know that much, how can it be a cliffhanger?
I don't know why the thread got the title, anyway. There were a couple of things that could have counted as cliffhangers, but most of the time the scenes just switched without anything that could count as one. Rather than Erfworld being a series of cliffhangers, they are rather rare.