Continuity mistake: In the shot in the bathroom, Tanya has a small diamond necklace but in the next shot in the bedroom the diamond appears larger.
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: Soon after arriving, Tanya and Rosie are at a bar and suddenly Donna comes out in tears. Tanya is just receiving a cocktail from Pepper, the bartender. Rosie and Tanya then hurry after Donna - and during the rest of this scene, the amount of drink in Tanya's cocktail keeps lowering then rising.
Factual error: When you first see Sam he is supposed to be in America, but when you see out of the window as he is leaving, you can see the Gherkin building in London. He is actually in the Lloyd's Building, but to add to the illusion of being in America, he is picked up by a Yellow Cab.
Continuity mistake: During the song "Lay All Your Love on Me" on the beach when Sky is on top of Sophie, you can see that Sophie has a pair of black trousers on.
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 Tanya and Rosie arrive at the island, they get off the boat and walk up the pier. They break into song with Donna (who is walking towards them) but as the shot keeps changing, the two old men standing on the pier disappear and re-appear every time the camera changes.
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.
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: During "Dancing Queen", Donna hides her face in the pillow while looking at Rosie and Tanya singing. On the right side of the bed where Donna is lying is a red table lamp, a glass cup and some stuff on the table. During the chorus, Donna jumps on the bed, and in the jumping shot, the table lamp and everything else on the table is covered with a white cloth with a red pattern.
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.