Sophie has flowers in her hair when she gets ready for the wedding. The flowers disappear and reappear, in varying amounts, between shots.
When Tanya is singing "Does Your Mother Know", she walks away from the bar and goes out to the beach to join the crowd of men who are dancing. As she's walking, there's a side shot of her, and in the background you see an extra with a towel around her waist wearing red wayfarer sunglasses. But then there's a face-on shot of Tanya, and the extra's sunglasses have disappeared.
During "Chiquitita", the amount of liquid in Tanya's glass changes between shots.
During "Dancing Queen" Tanya's stilettos turn into ballet flats, then back into stilettos in the next scene.
When Tanya and Rosie sit down on the boat on the way to the island, as they sit down Tanya has her hands in her lap. In the next shot they're up by her neck.
When talking about Sophie getting married Sam tells Donna that he has two grown children. Even if he married their mother shortly after he left and she got pregnant right away his kids wouldn't be grown. Minimum the oldest would be 18-19 since Sophie is 20.
But Sam left right after Sophie was conceived, if he married his first wife and conceived a child right away, the child would be just a few months younger than Sophie.
When Sam, Bill, and Harry first arrive at the Villa, they all seem known about Donna's daughter. Later, before "Dancing Queen," Donna says she never told any of the men about Sophie. We can assume that Sophie's name was on the invitations.
During "Chiquitita", Donna's friends force a beverage to Donna's lips. Though Donna acts like she is choking on the drink, the liquid never gets beyond the bottom half of the glass.
During "Lay All Your Love on Me", the close-ups of Sophie and Sky's embrace reveal a black waistline, meaning Sophie's lower body is fully clothed.
When Donna repairs the shutter with a cordless drill, the chuck has no bit, making repair impossible. The empty chuck is visible in subsequent scenes with the same drill.
After singing 'The Winner Takes It All' Donna runs away from Sam towards the church. The church is visible on the hill in the background- Donna runs in the opposite direction, out of shot, away from the church. Seconds later, she and Sam are climbing the hill.
At the very beginning of the film, when Sophie is using the very small rowboat(?) to take her to the mailbox, the boat has no sails, and no oars are in use. Sophie is only standing at the rear of the boat using the tiller to steer, and yet the boat is moving along at a pretty good clip. What's making the boat move? There's no visible method of propulsion.
When Sophie swims back to the beach to meet Sky who is going on his stag do, he is holding a cigar the wrong way round, the lit end is in Sophies hair.
On the ride home from picking up Tanya and Rosie from the boat, the way Donna turns the steering wheel bears little relation to how the car actually moves. Many times, the car would have gone over the edge.
The "time of the flower power" was the late 60s to early 70s. The photos of Donna with the possible dads clearly show hippies of the time.
If Sophie is 20, then twenty-one years later is barely into the 90s, at the very the latest. Sky could not be building a website then. His goal is to bring tourists. People were just getting to the Internet in the mid-nineties and travel websites were few and far-between.
Just after Tanya and Rosie arrive, Donna takes the laundry down and says "You'd think they would figure out a machine that would make the beds." Her mouth doesn't move during part of the sentence.
When Donna, Rosie, and Tanya are on the sofa, Donna tries to get up, and Tanya forces her to sit down. Donna emits a high-pitched laugh, but her mouth never moves.
When Sky hugs Tanya for the first time, Donna says 'And all true!' yet her mouth movements don't match.
During "Lay All Your Love on Me", when the camera is on Sky's back as he draws near Sophie, his mouth moves twice without him singing.
When the orchestra begins after the initial verse during Harry's "Our Last Summer", some chords he plays on the guitar don't match the music.
When Sam is proposing to Donna, you can see a screen reflected in Rosie's glasses.
During one song, an extra is up a ladder, which is pulled out from underneath him, leaving him hanging from the window ledge. In the close-up, a safety wire is visible, going out of his clothes and up into the window.
Near the end, when Rosie is asking Bill to Take A Chance On Me, she falls and is hanging from the roof. In one shot when she has her glasses, a light screen can be seen reflected in them.
When Donna's friends singing to Dancing Queen you can see a crew member reflected on the hairdryer.
when a ladder falls a cable can be seen holding the stuntman,
"Our Last Summer," includes the lyric "that was the time of the flower power," which is usually a reference to the late 1960s. In the same scene, Harry says he traded his John Lydon tee-shirt to get a guitar for Donna. Lydon was a member of Sex Pistols, which formed in 1975.
ABBA's iconic lyric "My my, at Waterloo, Napoleon did surrender," is incorrect. Napoléon Bonaparte retreated from Waterloo in June 1815, attempted to hold his army together for a month, then traveled to the European coast, where he surrendered to the British Navy.
During the ending credits the cast is performing the song "Waterloo". The cast omits the second verse of the song.