In this segment, we meet Marcie for the first time, although her actual name doesn't come until later. I think she called Peppermint Patty 'Sir' due to her tomboy-ish behavior.
Thus ends Marcie's first appearance. She would return in September of that year for a visit, where her name is revealed.
Note: I'm guessing that 'Ha Ha Herman' is a take on Hide-And-Seek, but I'm not sure.
Note to Peppermint Patty: Open mouth, insert sandal!