How much d'you think the last ones will pay for the plumbing. They fell for it pretty simply.
Here we begin to see emphasis on Roy's fidgeting and anxiety of Frank in the house. Roy's OCD is shown by a strange, discomforted stance and unsure facial expression.
Let me close the blinds before we begin...
When Frank enters Roy's house, he immediately hastens to do what Roy would feel safe around - disinfect his hands. This is just one example of how Frank would help the patient - doing the small things that the person would prefer.
Even though Roy is acting strangely, fidgeting and looking unsure, Frank DOES NOT comment on this - he entices in normal conversation with Roy, not judging or talking to Roy about the disorder.
Okay, let us begin. Roy... so, what do you think this new washing pipe will sell for?
Frank further hastens to correct the small details that will make Roy's life much more bearable - closing the blinds will mean no sunlight can stream through the windows, which cause Roy hallucinations and fear. This initiative is vital in somebody helpful.
Roy Waller Medication OCD
In a scene where Roy is taking his normal prescription medicine, Frank does not comment. Again, he simply allows Frank to take it...
... and then continues talking with Roy about work as if nothing has happened, as if Roy simply had a sip to drink or bite to eat.