Mamma Mia! (2008)

Continuity mistake: During the song "Lay All Your Love on Me" on the beach, when Sophie lies back and then Sky is on top of her, in this closeup we see Sophie's wearing something else over her swimsuit. It's visible below her waist and as she lifts her right leg. (00:45:00)

Donna: You sound like you're having fun already.
Ali: Oh, we are!
Donna: I used to have fun!
Ali: Oh, we know!

Trivia: All of the entire cast performed their own singing.

Question: When is the movie supposed to have taken place? There is reference to Donna having dated and presumably conceived in the 1960s. That would place Sophie's wedding, at age 20, no later than 1990. But isn't that a little early for Sky to be putting the Villa Donna on the internet?