I suggest that there would be no way to make Stana Katic look bad. Holy smoke, she is gorgeous! In fact, the principals are all pretty people. All of that to one side, though, this is a funny and good natured show that I look forward to seeing every week. I think I have said so before but at the risk of being accused of repetitiousness I have to say again how terrific I think Fillion is at the kind of banter filled comedy-drama that goes on in Castle.
I agree that using Patricia Highsmith's Strangers on a Train ploy really worked in this episode. It strung out the suspense concerning whodunit and created a neat reason for allowing everybody to avoid paying off the bet.