GREASE - Putzie changes standing position

When Danny and Sandy get introuduced to Kenickies date Cha Cha look at where Putzie is standing he is in back of Jan(his date) you only see his head sticking out in between Cha Cha and Jan. Then when everyone is looking over at Dooby when he ask "Who is she?" and then Cha Cha explains who she is and then Frenchie says "With the Worst Reputation." You see a clear open shot of Putzie standing right next to Jan. Then when Danny puts his arm around Sandy and says to Sandy "Lets go Sandy" Putzie is standing in back of Jan again. Putzie changes his standing position twice.