Continuity mistake: Once Jimmy sees Lois outside the Nite Club, he comments on what she is wearing. In the first shot, he has the strap of his camera around his neck and down his chest. It cuts to a close up as he makes his remark and suddenly the strap is gone. Then in the next shot after Lois grabs him by his earring, the strap is back, but only over one shoulder. Also in the shot where the strap vanishes, the people around him instantly change around.
Picture added by Quantom X