Transcript:
Shermy sits behind Patty in class. He says,"I didn't do my homework..."
He rests his face on his hand and continues,"If the teacher calls on me, I'm sunk! Why doesn't the bell ring?!"
He continues,"It looks like Patty's my only hope..."
He leans forward and whispers to her,"Psst..Patty! See if you can start a filibuster..."
This gag is recycled from the Li'l Folks comic strip for February 22, 1948:
Yeah, I've been kind of wondering about that. The older Peanuts strips seem to have been scanned from whatever was lying around, because the copyright date jumps around a lot between consecutive strips sometimes. Probably the Li'l Folks strips were scanned separately by someone that cared more.