Time-traveling Americans visit 1776 to seek advice from the founding fathers, but a malfunction sends them to 1976 instead. Assuming they're still in the past, they try to learn from this supposedly perfect society, surrounded by 1970s humor, items, and celebrities.
The Spirit of '76
Three time travelers embark on a mission to retrieve the U.S. Constitution in 1776, but a magnetic storm in 2176 causes them to land in 1976 instead, where they are mistaken for extraterrestrial beings.