When the professor returns to the night club and sees Lola again, he gets covered in her makeup and moves to the mirror to clean himself up, which he does not completely manage. Yet, when confronting the captain, his clothes are completely clean. After he has thrown him out of doors, the stains reappear.
When the professor tries to cool the curling iron on the calendar, he tears down the date of November 27 and November 28. In the closeup, the date of November 24 appears.
When the professor returns to his class and the boys burst out in uproar, the drawing on the blackboard shows three lines with Lola's name. The director, drawn by the noise, enters the class and now there are only two lines. After the class is dismissed, the third line has returned.