Not unreal, but perhaps the volume of depiction and such was more aspirational than reality.
The picnic scene is a lot like the picket fence suburb scene. Iconic atomic family American dream.
To be fair, though, my pickup is a 1946 Dodge.
It makes me wonder if the poor of 1955 had more picnics.
The family has just driven the family car into a beautiful spot for a picnic. Wife remarks to husband how beautiful the spot is. Husband says "it's perfect."
Shortly after that they get ready to leave. The blanket is strewn with beer cans and other trash. With a flick of the wrist, husband ejects the trash into the surrounding landscape and wads up the blanket.
Trash problem solved, apparently.
Despite the careful attention paid to selecting period office furniture, this show is in fact, fiction.