When users post from the Android app, the system adds a "via SE Android Mobile" tag to the comment, like the highlighted message below:
The problem is that the message only appears on mouseover/hover. It's there for both the first and second comments in the image, but only the hovered comment shows it. So, there's a huge and awkward gap between the time ("4 hours ago") and the "edit" link for any non-hovered comments posted via the app.
This image is from meta.ebooks.stackexchange.com; I have not yet been able to find instances of it on other sites.