Visible crew/equipment: When Homer follows Rose Rose inside after finding out she's pregnant, there is a visible "T" taped on the floor for him to stand on.
Visible crew/equipment: As Homer is first leaving the orphanage, there is an overhead shot that pans upwards as Wally drives off. The camera is visible for a split second in the vehicle.
Answer: She was not married to the baby's father, which would have been an absolute stigma at the time.