Without James Roday, Psych probably wouldn't be around today, canceled only after a couple seasons. Listening to the dialogue, it's quite surprising how much of the dialogue is either nonsensical or unfounded teasing. But when James Roday says these lines, Shawn seems like a reasonable, nice, charming guy. He may be blabbering about something completely random, but it's hard not to like him.
"Shawn Rescues Darth Vader" is mostly a standard episode with the fake psychic stuff, the attention to detail, and the other staples. What's interesting about the episode, though, is that the writers actually acknowledge the fact that Shawn blatantly lies to everyone's faces about his powers. This is a big deal, after all, not something that can be shelved. Under interrogation and hooked up to a polygraph machine, Shawn gets out of it unscathed, lying directly to Lassiter and more importantly his girlfriend Juliet. I have doubts whether the writers will continue these ideas this season, but it's a start.