Forget the fact that the plot's a bit flawed (it's Charlie's Angels, for God's sake, which I don't believe anyone ever tuned into expecting a seriously deep intellectual script, not even in the halcyon days of Kate Jackson and Farah Fawcett), and, yes, Kelly's fear and nervousness is inconsistent with the character she's built up over the previous 100-odd episodes, but... there's menace in the air - I always enjoy the grittier episodes of Charlie's Angels, in downtown Los Angeles, rather than when they're cavorting around Hawaii or Las Vegas.
The opening music is great. And that late 70s/early 80s jazz funk groove continues through all the scenes - there's more background music in this one than most Charlie's Angels episodes.
As a Londoner, I love the red British phone box at the entrance of the hotline club.
Paul Cavonis has appeared in other Charlie's Angels, and is an excellent actor - I, certainly, was fooled, and had him down as the main suspect.
OK, without Kate Jackson, Charlie's Angels wasn't the same after the 3rd series, we all know that, but once you get your head around the fact that she's gone, there's still some good stuff in the 4th and 5th series.
Sad that the actor who played the transvestite murderer (Bruce Watson) appears to have been quite confused and conflicted in real life too, taking his own life.
For all it's silliness, there's always been some deeper reflections to Charlie's Angels.