Trivia / Mamma Mia! Here We Go Again

• Career Resurrection: Amanda Seyfried was in the midst of a career decline throughout The New '10s with roles in flops like Gone and Pan, after becoming known in the prior decade with many of its most popular shows and films. This film's success revitalized her career, which was bolstered by career-best work in Mank and The Dropout.
• Creator Cameo: Benny Andersson is the cafe pianist in the "Waterloo" number. Bjørn Ulvaeus is one of the professors on the stage during "When I Kissed the Teacher".
• Fake Nationality: Plenty of it on the flashback side. We have Lily James and Jeremy Irvine as the young versions of the American Donna and Sam respectively, and Josh Dylan as the young Bill Anderson, who is Swedish. All three actors are British.
• Fake Mixed Race: Donna, played by the mostly German, Swiss, English and Irish Meryl Streep (and the English Lily James) is the implied daughter of Cher (half-Armenian American) and Andy Garcia (Cuban American.)
• Playing with Character Type: This is Lily James in a period piece, per the norm... except instead of a costume drama, this is a campy musical set in the late 1970s. Donna's also a lot more energetic than James' previous roles.
• Queer Character, Queer Actor: The younger Harry, who was depicted with a male partner, is played by gay actor Hugh Skinner.
• Reality Subtext: As if the scenes where Sam grieves for Donna weren't already sad enough, Pierce Brosnan's first wife died only one year earlier in life than Donna did (Donna was 44, Cassandra Harris was 43).
• Refitted for Sequel: Some of the songs from the musical that weren't included in the first film were added in the sequel.
  • "Thank You For the Music" was recorded for the first film's soundtrack, but was never used in the film proper until "Here We Go Again" used it.
  • "The Name of the Game" was a song for the first film soundtrack, but was redone using Donna instead.
• Separated-at-Birth Casting: Of the Timeshifted Actors, Jessica Keenan Wynn (young Tanya) resembles the older version of her character the most.
• Sequel Gap: Ten years passed between the release of the first film and this one. Five years in-universe.
• Trailers Always Spoil:
  • Cher's appearance was clearly supposed to be a big surprise at the film's ending, but was spoiled in the very first teaser.
  • Sophie doesn't discover her pregnancy until well into the film. Practically all the trailers spoiled this. Some of them even feature Sophie saying, supposedly to Tanya and Rosie, "I'm pregnant, but I don't know how to do this on my own", a line that doesn't even appear in the actual movie.
• Those Two Actors: Fans of Les Misérables (2012) got quite a kick out of seeing Amanda Seyfried and Hugh Skinner coincidentally being in the same movie again.