The One Where Ross Got High - S6-E9
Visible crew/equipment: After Ross and Monica blurt out each other's secrets to their parents, when Jack says, "And we kind of figured about the porch swing," in his closeup we can see the end of the set wall, with the soundstage behind it and many tape marks on the floor.
The One Where Ross Got High - S6-E9
Visible crew/equipment: When Ross takes Chandler into the bedroom, a stage light is reflected in the tv. (00:09:55)
Answer: The painting doesn't have a name, and if it does it is never mentioned in this episode.