Since I keep seeing people mentioning this, I thought I’d throw out my two cents on the matter.
When Roy buys that car full of flowers, he calls Riza and says he got drunk and bought them. The thing is, unlike what many others seem to think, I am pretty sure he was not drunk at all. That was just the cover.
Look at the entire scene. He hadn’t been to a bar, he was getting information relayed to him by one of his sisters while sitting in his car. Then he gets more information from the woman selling the flowers and he’s very serious about it. If he were drunk, I don’t think he’d be able to absorb all that info very well. He wouldn’t do that. The info his sister gave him was too important for him to listen to while drunk. Roy is too smart for that.
And later, he buys all the flowers as thanks for the info, but then realized he has nothing to do with them. That’s the absent minded, dorky Roy showing through. He was too concerned about getting information and making sure the woman got payed for her troubles that he didn’t stop to think ahead. Then again, maybe that was also part of the gimmick. He bought the flowers on purpose so he could then act like he was drunk and no one would be the wiser.
Either way, he then calls Riza and pretends to be drunk. That’s his excuse. His cover for calling her and buying the flowers. Anyone that’s watching would have no reason to suspect otherwise and would probably ignore him.
I also like to think it was his reason to be able to see her. They hadn’t seen each other for a while and he missed her. He hoped she would accept his offer of flowers so he would have an excuse to go to her place and talk for a bit. He hadn’t planned on her refusing to see him because of serious problems on her end. That was a surprise, and you could see he was definitely surprised and concerned.
Anyway, the point is, Roy was not drunk during that scene, it was a cover for anyone that might have been watching or listening. Remember, Roy is a very good actor.