The One With the Baby on the Bus - S2-E6
Continuity mistake: When Joey and Chandler are on the bus, they pull up just past a sort of concrete-arch gateway on the right. Then when they chase after the bus, you can see them running towards this archway again. (00:10:50)
The One With the Baby on the Bus - S2-E6
Continuity mistake: In the scene where Chandler and Joey want to meet women with Ben, Chandler is holding the baby. A little after Chandler says, "Oh seriously you want him?" The position of Chandler's hands holding Ben changes between shots. (00:05:55)
The One With the Baby on the Bus - S2-E6
Continuity mistake: When Stephanie is singing "Angel in the Morning", there is a person in overalls sitting behind the green pole. The shot changes to Phoebe outside and you can still see the person; it changes back to Stephanie and the person is now sitting on the next table. (00:16:00)
The One With the Baby on the Bus - S2-E6
Continuity mistake: When Rachel is introducing the "professional musician" in Central Perk, just as she walks off a bald black man in a red shirt walks past the window. Then the woman sits on her stool and the man walks past again. (00:13:50)
The One With the Baby on the Bus - S2-E6
Continuity mistake: When Chandler and Joey fetch Ben from the Department of Health Services, as they say they're both the baby's father, Chandler puts his arm around Joey and Joey takes his hand. When the angle changes you can see Joey's shoulder and Chandler's hand isn't on there. When it cuts back to the front view, his arm is around Joey again. (00:15:10)
Answer: The painting doesn't have a name, and if it does it is never mentioned in this episode.