Spoilers: Thought the movie was fun, but...
There are a couple issues with the movie:
1. Wouldn't the girlfriend have already skipped town with the money before she was identified all over the news as the one who burned John? Why did she stick around until the next morning and give the cops and John time to figure out what she had done?
2. Wouldn't the police have already suspected that the teller (the girlfriend) was possibly in on it? Isn't the police 101 in a bank heist: Inside job.
3. Warwick always knew that John was lying AND he was the guy he was supposed to be capturing in the bank heist case he was working (the gf had already identified him to the police although John didn't discover this until later when he heard it on the radio). The stupidest possible thing Warwick could have done was exactly what he spent the first two thirds of the movie doing.
4. Considering who John was, Warwick could never have let John go. He would have had to REALLY kill him regardless of the fact that John won the chess match. Warwick then reveals that he NEVER LIES and is forced to keep his word and release John. Warwick then spends the rest of the movie lying to everybody...seriously?
5. Warwick baits John after he releases him, and John grabs an ornamental dagger from off the mantle and stabs Warwick...only to discover it's a set prop with a retractable 'blade'. WTH? Why was it on display over the mantle? How did Warwick even know he would go for this as opposed to any other handy weapon of opportunity?
6. How does Warwick live in lavish luxury when he is a detective? How is he in charge of a major case that occured THAT very day, yet he did not work THAT day or the next? Remember his partner comes to his house the next day and interrupts Warwick on his 'day off' with a hunch before Warwick has cleaned up the house completely.
7. John mails one of Warwick's polaroids to Warwick's partner. When did he grab this picture? The only option is John took it from Warwick's house after Warwick allowed him to escape from the parking garage. Why then, did he pick the least incriminating picture? Why didn't he take the entire 'dinner party' album for that matter and deliver it to Warwick's partner?
8. Warwick should have killed John in the parking garage. There was a NESCESSITY to do so, and ZERO reason not to.