I have noticed some interesting behavior with permalinks.
When I append an intiger to the end or a url, it has no effect on whats loaded .
an example: http://example.com/my-page behaves the same as http://example.com/my-page/1234/ even though there is no page with the name 1234. it simply ignores the number. this happens across any permalink structure.
however if I append 2 sets like http://example.com/my-page/1234/1234/
then it 404's as it should.
Any idea why WordPress ignores the integer?