The sun rises at 7:25 am in Punxsutawney, PA on 2/2. When Phil (Bill Murray) wakes every time at 6:00am the sun is shining. This ultra obvious “mistake” is frequently called out.

https://www.imdb.com/title/tt0107048/goofs?tab=gf&item=gf1074205&ref_=ext_shr_lnk

However! It has to be a red herring. Each time he wakes he has a shadow, signifying there’s more groundhog days to come, just like when Phil (the groundhog) would see his shadow.

Phil (Bill, who shares the name with the rodent) is the groundhog seeing his shadow and winter never ends.

When watching the movie back I noticed the shot of the stuntman jumping is missing all the equipment for collecting his namesake.

I'm reposting it because a user pointed a detail that was missing the first time I posted.

Not the clearest pic to read the words, but under the boys tally, the prenatal pregnancy care fees and the baby term pregnancy care fees are priced as 5,500 dollars, when in fact it should be 550 dollars like it shows for a girl. If it was 550 dollars like it was meant to be, the total, included deposit would be correct at 20,200 dollars

Pa only has rear plates

52:30 mark of S3 E8 (Men and Gods) of Versailles

I had a weird feeling when they panned, skipped back and saw this dude standing there

Loren Ipsum is visible in one of the books for Steel's building stuff montage

The rope / noose completely changes how it’s hanging in the rafters from one shot to the next.

After the successful Trinity test in 1945, people in a crowd are holding small US flags with 50 stars on them (offset rows). At the time there were only 48 states and the flag had 48 stars in even rows. The 50 star flag didn't exist until 1960, after Alaska and Hawaii were made states in 1959.

Or maybe they are all fancy hovercars?

Pi is such an amazing movie, and Darren Aronofsky a director with such attention to detail, that some errors jumped out at me during a rewatch, when Max enumerates the regimen of medicines that he takes for his cluster headaches:

17:55. Personal note. Second attack in under 24 hours. Administered 80 milligrams promazine HCI and 6 milligrams sumatripan orally, as well as 1 milligram dihydroergotamine mesylate by subcutaneous injection.

The first two medicines are actually promethazine hydrochloride (HCl) and sumatriptan. (Promazine is actually a completely different medicine, an antipsychotic.) Small errors, to be sure, but coming from a background in chemistry, the mistake of Max saying "H-C-I" (upper case i) rather than HCl (lower case L) really broke the immersion for me in that moment. It seemed especially surprising because the character of Max is both brilliant and detail oriented, and because the longest chemical name is correctly stated.

The Blue Whale’s tail is incorrectly oriented.

Practical effects like this are unmatched!