This really is a great story with so many memorable parts to it. My only small complaint is that Aunt Edna is so, absolutely unlikely to have ever carried out that Murder that Dale would have been better framing any one else.
Yes, I agree the scene with Tracy's landlady going through her photo album and talking Columbo's ears off, is an absolute gem.
It has another thing in common with Prescription: Murder. Each one has a female accomplice, and each accomplice is unprepared for the sight of the victim. Those might be the only two episodes with a moment like that (I'm not sure).