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: During the last half of the movie Donna wears a red sweeping shawl over her shoulders, with her outfit for Sophie's wedding. Many times the position of the shawl is not consistent during shots - most noticeable after she walks Sophie down the aisle, then sits down. (01:21:05)
Continuity mistake: During the wedding scene, all three of Sophie's possible fathers stand up and gather behind her on the aisle. In one closeup shot Sophie turns around to say something to Sam - in this shot the right part of her hair is behind her right shoulder. In the next shot as she is turning around back to face the priest, her hair is suddenly neatly in front of her right shoulder. (01:25:50)
Continuity mistake: When Sophie is finally dressed for her wedding, the gauzey material is predominately over her right shoulder/breast. Next shot it is over her left. When she gets on the donkey, it is completely off her right side and her bra shows.
Continuity mistake: When Rosie and Tanya follow Donna into the bathroom, during the "Chiquitita" scene the flower pot on the windowsill moves back and forth from the left side to the right side.
Continuity mistake: During 'Winner Takes it All', at the start of the song, Donna has her hands up near her chest, in the next shot they are down by her side.
Continuity mistake: In the Super Trouper scene, when we see Donna, Tanya and Rosie raising their left hands, we see that Rosie is just behind Donna's sleeve. However, in the next shot, in which we only see Donna, we can't see Rosie or her shadow at all.
Continuity mistake: When Donna is dancing to "Dancing Queen," her hair is all messed up. But in the next shot, her hair is not messed up.
Continuity mistake: During Dancing Queen Donna is jumping on the bed. Between the camera angles, her position keeps changing.
Continuity mistake: At the end of Voulez Vous, the people pick up Sophie. In one shot her hair falls down to her shoulders, camera cuts and it falls back down again.
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.
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 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.
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.
Continuity mistake: When Sam tells Sophie that they could do a test to see who her father is, Sophie raises her hands to her face twice.
Continuity mistake: When Donna is fixing the crack in the tiles, the tip of the filler-gun breaks off. She stands up, and a bit later waves the filler gun, with the tip back on. The pistol has been out of sight (her hands down) during the scene, but she didn't look down once, and we see that she is carrying a bowl in the other hand, so she would not have had a chance to put the tip back on again.
Continuity mistake: At the chapel, Sam has just proposed to Donna. She says she's not a bigamist. Sam says neither is he and that he has loved Donna for the past 21 years. To his right stands Sophie, who after hearing Sam say this, is all choked up and looks like she's about to burst into tears of joy. Immediately after you see this expression we see Donna very briefly (one or two seconds). When the shot goes back onto Sam and Sophie, Sophie has a huge grin on her face. Nothing is said by Donna or Sam in this extremely brief period of time that would justify her instantaneous change of expression.
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