Continuity mistake: 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. (01:10:30)
Continuity mistake: When Sky is on the beach with Sophie, his arms are constantly changing place depending on the shot. This is not due to dancing.
Continuity mistake: When singing Mama Mia the first time, the position of the mum's arms are constantly changing between shots.
Continuity mistake: When Tanya first arrives, at the end of the song, her arms constantly change place between shots.
Audio problem: Sophie and her boyfriend sing at the beach, he says he likes to smoke and pronounces the word "true" with the camera facing him. Right afterwards there's a side shot and music is heard with no lyrics, but he is mouthing as if singing. Then back to a front shot and now he sings and mouths.
Visible crew/equipment: While Sophie's with Lisa and Ali at the dock, after they admire Sophie's engagement ring Lisa bends down to pick up her handbag, and there's a rather large bulge at her lower back under her top - presumably the mic pack, which wasn't there when Lisa lifted Sophie and spun her around.
Continuity mistake: While Ali and Lisa are trying on the dresses for Sophie's wedding, after Sky leaves the room with his props, when Ali and Lisa stand up only one side of Ali's dress is over her shoulders in the shot facing Sophie, but in the shot facing Ali and Lisa both sides are over Ali's shoulders properly.
Continuity mistake: When Rosie and Donna are trying to get Tanya's boots off, Tanya is lying flat on her back. The camera does an instant cut and she is now propped up.
Continuity mistake: When Meryl Streep closes the bedroom door in the scene right before "Dancing Queen", you see Julie Walters' reflection in the mirror next to her, hands on her hips. In the next shot Streep turns to face Walthers, who now suddenly hasn't got her hands on her hips anymore. (00:34:15)
Revealing mistake: Towards the end of the Money Money Money song there is a scene where Donna, Rosie and Tanya are sitting in the Captain's deck. If you look at Rosie you will see she is looking through binoculars. Look closely and you'll see that the lens caps are still on.
Visible crew/equipment: 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.
Continuity mistake: 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. (00:08:50)
Other mistake: When Harry Bright and Sam Carmichael are standing on the dock in Greece after missing the boat, Harry pulls out his invitation and references the wedding in the invitation, but the envelope is sealed. (00:08:20)
Continuity mistake: When they are singing Does Your Mother Know You're Out, a man is seen getting out of water and is soaking wet. However, a few shots later he is completely dry.
Revealing mistake: During the "Lay Your Love" song, when Sophie and her boyfriend are in one of the corners of the beach, sneaker footprints are seen. Given that the tide is constantly wiping off their bare footprints, the tracks most surely belong to a crew member. (00:44:20)
Other mistake: Donna sings The Winner Takes It All and it is nowhere near sunset. During the song she makes her way up to the church. But when she arrives, there is a good sunset.
Continuity mistake: Donna, Tanya and Rosie are singing Super Trouper for Sophie's Hen Party - when they get to the end of the song and all 3 ladies put their hands one of top of each other (whilst they are singing 'Like I always do') and then lift them above their heads. Rosie's hand has changed, in the first shot it is her right and in the second her left hand. (00:48:40)
Continuity mistake: On the boat when they are singing Our Last Summer, Sophie is seen sitting next to Bill. In this shot she is holding a picture of Bill in her hands. The camera cuts and now Bill is holding the photo. (00:40:45)
Continuity mistake: During "The Winner Takes It All," you first see the cliff with the church and the sun very low on the horizon. Later during the scene, the sun is much further to the right and higher in the sky (the sun glare on the water is bright white). The scene was apparently filmed in the morning (and not in the evening) and we see a sunrise and not a sunset.
Visible crew/equipment: When Sam is proposing to Donna, you can see a screen reflected in Rosie's glasses.
Chosen answer: Meryl Streep and Pierce Brosnan got married because they loved each other and had done for many years. The daughter changed her mind about getting married because she realised what really mattered to her and that seeing the world while they were young and free wasn't such a bad idea after all, that she didn't need to get married and hang around for her mother's sake.
Purple_Girl