Other mistake: The snow globe from the original is in the loft in the new film, but in the original film, as Mary was leaving the Banks house while they flew a kite, she packed it in to her carpet bag.
Other mistake: At the beginning of the movie, Kate is going through old tapes recorded by her dad on a TRV280 handicam. The second tape shows her as a baby in her dad's arms and it's dated Dec 25 2007. She starts a recording on a leftover blank tape and we see the date; Dec 24 2018. Her brother taunts her holding the camera out of her reach and tells her "You're 10 years old. Almost 11!", and she asks "So?" She should have said "You jerk, you don't even know my age?" She is 11 already. (00:01:00 - 00:04:15)
Other mistake: Towards the end, Chewbacca and Beckett have walked some distance from the landed yacht. They come up a small slope and are faced with Han, waiting for them. But an aerial shot shows that slope is very short and just runs down to a cliff. There's no way they could have got to the base of the slope to walk up it in the first place.
Other mistake: Vanellope steals a car from the Slaughter Race game and speeds off. Shank, the main character of the game, commandeers another car and chases Vanellope. When Shank's car is seen in Vanellope's rear-view mirror, the image is not reversed. Shank appears to be driving from the passenger seat.
Suggested correction: We see the mirror and it in fact is a mirror image of Shank driving.
Other mistake: When Tom picks up Atlanna when she washes up, she's unconscious, but she's able to hold on to her trident.
Suggested correction: It is emphasized that she is still holding it even when unconscious.
Other mistake: When Vera returns to her house, a calendar with 2017 listed as the year can be seen on the wall. The present-day scenes take place in 2014, so there shouldn't be any reason for anyone to have a 2017 calendar. (00:56:55)
Other mistake: McGonagall appears as a young professor at Hogwarts, even though the movie is set in 1927 and she wasn't born, according to the official Harry Potter canon, until 1935.
Suggested correction: JK Rowling, who had admitted she's terrible at math, has changed her mind about McGonagall's age multiple times. First she said she was 70 in 1995 (putting her birth year as 1925), then on Pottermore she said she was born in 1935, then after this movie came out she nixed that section of Pottermore and left her birth year unconfirmed from then on. If the author who created this world can't make up her mind on how old she is, we can't definitively give her a year of birth either.