The most memorable episode for me was about a couple who faked the husband's death with a fiery car crash, complete with a body dug up from a graveyard. Soon after the husband's "passing", the wife had a new boyfriend, who turned out to just be the husband with a different name and hair color. They pretty much botched the whole thing, from an unconvincing car crash to a search history showing details on getting new identities. For some reason the picture they showed of the poor woman whose body they dug up to burn in the crash has always stuck with me.
Also, there's an episode that involves a box of sex toys being stolen, and I remember the woman they were taken from stating that she wasn't embarrassed about going to the police, but just didn't think it was a big deal at first (but then once it was obvious someone had been hiding in her house, she was rightly terrified, as he turned out to be a rapist and murderer). She seemed super frank and awesome, and Keith Morrison seemed delighted by her. It was a light point in what ended up being a pretty dark and disturbing episode.