Misconceptions in films set in the past

I just watched Peggy Sue Got Married (86) a few weeks ago. Kathleen Turner's character was inexplicably transported back in time to 1960.

Francis Ford Coppola directed it (which is why I watched the film..Vibrant colors!)

All of the cars shown in that time period seemed brand new, none had any rust.

I haven't seen them awhile, but I'll bet American Graffiti (73) and Back to the Future (85) made the same error.

Slight tangent:
Ironically, I had misconceptions about the past due to film and photography when I was 5 or 6 (1988/1989).

I totally thought "color" gradually became a thing prior to "black/white". Like a baby tree that grows and in many years would stand mighty tall with thick branches and lively leaves; I thought the same about "color". In '88, I thought things were much better and more colorful and so much more in focus, judging from my family photos and current films/tv shows of the time.

Usually they try and impose social standards of the time the film was made on the era the film is set in.

Hairstyles are often wrong.

Probably doesn't happen now due to CGI but in the past military equipment in war films was usually "played" by stand in equipment. Sometimes they looked similar, sometimes not so much. In the second Iron Eagle film from the 80's they use the iconic American F4 Phantom II to stand in for Russian Migs! I mean, I know they couldn't get actual Migs but at least don't use a well known American plane.

I can't recall the film now but they used a British Wessex helicopter which they dressed up to look a little like a Russian Hind gunship helicopter.

In some films battle scenes can either look way too modern despite being set in the Middle Ages or they can look like they are from the past even if set in current times or Sci Fi, ahem Star Wars, the battle scenes look like WW2 dogfights. In Empire Strikes Back you get a trench warfare scenario and Return of the Jedi the battle on Endor looks like Vietnam Guerilla tactics.

Sometimes it can be funny.

The existence of firearms is often completely ignored in movies set in, say, the 1400s.

Women's hairstyles and makeup - it was especially bad in the 50's and 60's

Another revisionist thing but generally speaking women weren't able to defeat men in hand to hand combat using weapons they probably weren't even able to lift at all or for very long.

Lingo and colloquialisms are often not period correct.

Modern-style casual or romantic sex, in eras where birth control wasn't available. Yes, casual sex happened in those days, but not without fear of pregnancy.

"Game of Thrones" was the one show that got that right, when the straight men chuckled with each other about casual sex, they'd say "Put a baby in her, man", or chuckle about bastard children.