This is a great episode for exploring the grey areas between good and evil. Not only with Ford, but how can we forgive Angel the suffering he caused Drusilla in the day? There are some beautiful moments between her and Spike here too. "I'll give you a seed if you sing."
I like the way Lie to Me pokes gentle fun at goths, goth nightclubs and the obsessions that some have with vampires. Which I'm certain BtVS never fueled. No, certainly not. "You look like a ninny."
It's nice to see Chanterelle before she goes on to play Lily/Anne in later episodes and in Angel.
There is nothing really to complain about in this episode aside from some poor make-up, but there isn't anything that makes it outstanding either. I think Lie to Me works better if you recast Ford as Pike (Luke Perry's character in the movie), as I know a lot of people did, but that's probably stretching for references where none were intended.
"The good guys are always stalwart and true, the bad guys are easily distinguished by their pointy horns or black hats and, uh, we always defeat them and save the day. No one ever dies, and everybody lives happily ever after."