Don't worry about the spots and tears - that's just a sign that its getting late in the season. Damaged leaves are normal this time of year.
The bigger problem is what kind of a Japanese Maple do you have? The red leaves aren't early fall color, they are red leaves. There is a third type of leaves at the bottom of the tree - I suspect they are from the root stock.
You may have a red colored maple that is reverting to green.
