It is almost funny how many people claim to see mountain lions/cougars in unexpected areas and the reports end up unconfirmed or just plain all out misidentifications. We have that going on with some regularity here in north Texas. People often misidentify domestic cats as these animals. They also get misidentified as the magical black panthers which don't actually exist. People find large footprints, almost always showing claw marks, and assume it is a mountain lion when in reality, it is nothing more than a big dog (they know nothing of footprint identification).
Bobcats get identified as mountain lions. Odd, but true. In fact, a hunting buddy of mine showed me a video of a 'mountain lion' that he took that was of a bobcat. He based his identification on its large size and ability to leap high up in a tree. Well, the tree was actually small and the cat had no tail. When the cat was compared to other things in the image, it was apparent the cat was much smaller than was initially perceived. Even so, the buddy now believes he has a giant bobcat.
Here is a hunter who called in a juvenile mountain lion that was roadkilled to the game warden apparently along with other folks.
http://texashuntingforum.com/forum/ubbthreads.php/topics/7195665/1 It was a bobcat.
This isn't to put down my buddy or other spotters of these cats, but to illustrate how sometimes the eye sees what the mind wants it to see.
And, that isn't to say that mountain lions won't venture into the suburbs, only that false reports and unsubstantiated reports are much more commonplace than verifiable reports.