American Splendor (2003)

Continuity mistake: At Harvey's retirement party, there's a close-up of a decorated sheet cake with yellow frosting. The cake is about to be sliced: a knife enters the shot from the right side of the frame. Smears of yellow frosting show on the last few inches of the knife blade although the cake is intact and the knife has not yet touched it.

Harvey Pekar: So... what are you worried about then?
Joyce Brabner: Well, it's the way... it's the way all the different artists draw you.
Harvey Pekar: What?
Joyce Brabner: You know, I don't really know what to expect. Sometimes you look like a younger Brando... but then the way Crumb draws you, you look... like a hairy ape, with all these wavy, stinky lines undulating off your body. I don't really know what to expect.
Harvey Pekar: No, those are motion lines. I'm an active guy.