When Jenny is talking on the phone to Peter, presumably from her house, the background is the very distinct, easily recognizable backdrop from Mike and Carol's bedroom, i.e., the frosted-glass, metallic gold-starred, light teal, wood-framed room divider from the Bradys' master bedroom. For this scene the bed that's normally in front of it, and whose headboard we normally see, has been removed, books placed on the room divider's shelf, and a chair put in front of it for Jenny to sit on, creating the illusion of a den or sitting room. There are no long-shots of this scene, only close-ups.
This episode features a very rare look at the wall in front of the dining room table, where the camera always is..
The $50 prize Peter got from the newspaper in this 1970 episode would be equivalent to $390.93 in 2023.