Was it supposed to have a 50s atmosphere?
It didn't seem very 1993 other than some subtle things like the mid-late 80s/early 90s cars everyone was driving, or teenage babysitter Polly. She and the dude Mickey she was making out with seemed like typical early 90s teens.
But besides that, when I think about it, there weren't any pop culture or music references (the only music was the jazz Mr. Wilson was playing in the attic) and I wonder did they intentionally make it more old school/innocent 50s-like so it would seem more like the old Dennis The Menace cartoon strip?
I know some little kids aren't much into fashions/pop culture and stuff as teens and younger adults are, but Mason Gamble sure came off WAY more old fashioned than a 5-7 year old of 1993. I mean more interested in a slingshot, building a treehouse, and being read stories than playing Game Boy and Super NES, lol.