Just after the song, "Yeh dil na hota bechara", Dev anand is standing beside Tanuja's car. The location is apparently an open place vegetation all around. When car turns to reverse and camera angle changes, the car (and Tanuja & Dev Anand) is in a street.
It is 8:30 p.m. when Vinay is with Shalu waiting to go to his night shift at the jewelers. After the goons snatch the ring from Shalu, Vinay goes to his father, the police commissioner to report the incident. At that point, it is clearly day time. Then it switches back to night time when he goes to the jewelry shop.
During the song "Honthon Pe Aisi Baat", Vinay and Shalu are performing for the royal couple but they are dancing with their backs turned to the couple, which is considered and insult.