Kiss Kiss Bang Bang/Headscratchers

• Why didn't Harry and Harmony just call Perry to warn him, rather than running all over Macarthur Park having a shootout?
  • The answer is probably that Rule of Cool trumps logic, and that it was an easy way to get Harry to witness the girl in the pink wig being shot.
  • It could be that having to answer his phone would draw more attention to Perry; Harmony may have been planning to draw him away from the park.
  • Perry could have turned his phone off. It makes sense to do so when you're tailing someone.