The flowers that Samantha holds change while she lays them on Johnny's grave.
Plate of cookies jumps from table to tray.
When the girls stop by the tree to take a break, as she turns off the radio, Teeny changes from standing to the left of her bike, to standing over her bike frame, with one leg either side.
When Roberta falls over on the road after missing her dive onto Scott on his bike, a man ahead with a briefcase hurries across the road before one of the other Wormers can cycle into him, and another one of the Wormers cycles ahead of him. After Roberta vows revenge on the Wormers, and when Scott yells back at her, the man is seen crossing the road again at a steady pace with all four of the Wormers coming before him.
When Roberta photocopies the page in the library, she takes the piece of paper from the machine and then there's no more paper sticking out. Then when it swaps to a different angle, there's paper hanging out the end of the copier.
The girls are looking into how "Dear Johnny" died. They are searching many large books, the bound newspapers from the past, but they know the date Dear Johnny died. They only need to look in the papers a published around that date.
Photo copier is way too fast for a 1970's model.
The flowers Sam picks are fake, with wires holding the stems together.
When Sam trips over in the cemetery, she falls onto Dear Johnny's cracked tombstone. As she pushes down, the 'tombstone' squashes under her hands.
After Chrissy punches Roberta, there is a towel visible around Roberta's waist.
When the girls are looking at Sam's mum out of the window, Teeny (Thora Birch) briefy looks over at the camera.
When Sam discovers the pages have been torn out of the Shelby newspaper book, the exact same text is printed on each part of the torn page.
When Samantha's parents have a fight and her father leaves she is reading a book by flashlight. The book is a Babysitters Club book which did not come out until the late-1980s.
In 1970 Indiana, public telephones were full phone booths, not kiosks on poles as depicted in this film.
The money used in the diner scene is clearly currency from the 1990s, yet the scene takes place in the 1970s.
The Gaslight Addition neighborhood is actually the Country Walk neighborhood in Savannah, GA. The earlier scenes of the movie are set in 1970, but the houses used in the movie are architecturally characteristic of and and were in fact built in 1990.
Roberta has the LP 'Meet the Brady Bunch' on her dressing table in 1970. The album was released in 1972.
When the girls are painting the garage and the Wormer brothers walk by, one of them insults Chrissy and calls her "lard butt," though it's clear from his mouth movements that he was actually saying "lard ass."
The psychic says, "I know," but her lips are reading, "be seated."
When Roberta turns to look at the boy who said girls can't play softball the camera track is visible.
In the big game of Red Rover at the beginning of the film, as Bobby runs over to the four girls, in one shot all of the four girls tape markers on the grass are extremely noticeable. Sam is standing on a red one, Chrissy on a blue one, Roberta on a green one and Teeny on a yellow one. They're obviously gone in all the following shots.
When the camera pans along Sam's room, the black reflection of the passing camera is reflected in the crystal ball on her desk.
There's a reflection of the camera lens in Teeny's room window, as the shot pans upwards, with her white cat sitting on the ledge.
When Roberta runs over to the limo, to talk to the driver about letting her use the limo to get to the hospital, there is a microphone bobbing around, perfectly reflected on the limo windshield.
In the movie they say that their home town is Shelby, Indiana. Shelby, Indiana is in the north western part of Indiana. They went to Greenfield, Indiana to go to the library, on their bikes. That is impossible: they are approx 150 miles apart.
On the railroad bridge, at the beginning of the scene where they go to see the "Mystic Advisor", it says ACL RR for Atlantic Coast Line Railroad. This railroad only ran in the south east United States. The movie is supposed to be in Shelby, Indiana. They would have had to ride their bikes to, at least, Winston-Salem, North Carolina to see a bridge like this.
When the girls are looking for articles from 1945 in the newspaper Roberta finds an article about her mother's death. Her mother would have had to have died after 1958, therefore Roberta shouldn't have seen the article unless she wasn't actually searching in 1945 like her friends were.
In the cemetery for the seance, it was supposed to be summer time, yet when the girls exhaled, you could see the mist from them breathing. It's not that cold in the summer.
Reflected in limo windshield.
Reflected in limo door.
Sam is seen with a map of Indiana in her car. Considering she is going to her childhood home and the very house her friend lived in as a kid, why does she need a map? No one needs a map to find their old home town.