Tons. Here's just a few.
1. Why the logo for Westworld was drastically different for William than it is in the current time frame.
Why do you think this matters? Yes, designs change over time, but there's no guarantee that every single instance of the WestWorld logo would be updated to fit changes in said design
2. Why the subway that William arrived in was shiny and bright and new, while the other time we've seen it was run down and all but abandoned.
We've seen an area that LOOKS like it could be the "subway" entrance to the park, but you're drawing conclusions based on your "pet theory" that don't actually fit the facts that we've been told.
3. How Lawrence can be dead and badly damaged but instantly up and running Pariah in an ongoing storyline that's clearly been running for more than a couple of hours, not to mention miles and miles from where he died. (And don't even try to say they have multiple copies of the same host; they've made it clear they don't do that, else they could have simply replaced Delores' dad with another host that looked exactly like him. Hell, they wouldn't even need to repair the badly damaged ones at all given how apparently cheap they are, as evidenced by the floors and floors of storerooms with defunct models.)
I already admitted that I can't explain this one, but that doesn't invalidate any of the other things I mentioned that the show and showrunners have presented/said that refutes the notion of multiple timelines.
4. Why we haven't seen William with --anyone-- from the current time frame other than some of the hosts.
5. Why haven't we been given a name for the Man in Black, despite him clearly being someone people recognize and know from the real world; there's absolutely no other reason to keep his name a secret other than we already know what it is. (It's William, by the way.)
Both of these things are you "putting the cart before the horse" and making assumptions/drawing conclusions that fit your personal "pet theory", even though they run entirely counter to things that we've been shown/told by both the show itself and the showrunners, and even though they ignore a lot of the things that I previously outlined concerning the way that the series' narrative is being established.
Oh and to refute one of your big "zinger" points; we haven't seen inside any of the hosts in William's time. All we've seen is that they (or at least some of them) bleed when damaged. In fact, that was a key point that the Man in Black said in that episode; in the past he opened one up to see what they looked like on the inside. I have no doubt we'll see William doing exact that in whichever episode they finally reveal them to be one in the same.
As I outlined previously, we've seen two different versions of the Hosts: "Old Bill" (who is an animatronic construct, and who acts and behaves as such, with jerky movements and canned dialogue repsonses) and the "current", more human-seeming Hosts (who look and behave like humans and actually bleed). If the Logan/William storyline were taking place in the past the way that you're claiming, each and every single Host we see would look and behave like "Old Bill, and the very fact that they don't kills the notion that we're dealing with two different timelines on its face.
You also didn't bother to address the fact that we hear OLD Robert Ford's voice when Dolores is extracted from Pariah, or the fact that Dolores is even with Logan and William in the first place and able to behave as she is (behavior that can only be a direct result of her being "awakened" in The Original by the "these violent delights have violent ends" trigger phrase), or the fact that, in her conversation with Ford, which directly follows the scene where he extracts her from Pariah, she's exhibiting behaviors that, again, can only be a direct result of her having been "awakened" in The Original).
Between your making assumptions that don't necessarily mean anything, choosing to ignore stuff that doesn't fit your personal pet theory, and not bothering to address legitimate things that run contrary to said theory, you're not instilling much confidence in the notion that you're right.