Whenever we see a parallel or "bizarro" universe depicted in a work of fiction, the key to keeping them grounded in a way that doesn't totally lose the audience involves focusing on the constants and variables between them.
For instance, the bizarro world in the DC Universe also has a Superman. But rather than being an even-headed paragon of justice, he's a chaotic beast with a lot fewer smarts to work with than the one in the normal world.
But while this version of the idea leans heavily on the variables, the parallel universe in Futurama is all about the constants. Essentially, it's exactly the same except that everyone is dressed like cowboys in the "bizarro" one.
But while it's basically impossible to tell what a real parallel universe could look like, or if such places even exist, seeing them in fiction has at least given us some expectations of what they might look like.
And I say all of that to say that what we're about to see on this list probably wouldn't look out of place in them.