The speaker shares three things they have learned while working in the motion pictures: learn lines, find mark, and don't ask too many questions. The speaker then asks a detective if they are a suspect and provides an alibi of being at Inky's diner with a receipt. However, the detective informs the speaker that they have broken rule number three. Working in the motion pictures as long as I have? I've learned three things. Learn your lines, find your mark, and don't ask too many questions. Say, detective, I'm not a suspect, am I? My alibi? I was at Inky's diner. I've got a receipt in here somewhere. Sorry, Vince, but looks like you broke rule number three.