In the final scene during their concert, they finish their routine by "freezing" in poses which change between shots.
During the girls' pillow fight, the orange pillow becomes purple when thrown. When the girls have a pillow fight.
Victoria's position in the bed changes twice.
When the girls are in the rotunda in the garden in their robes, Victoria keeps changing position and changing what she is doing with her mobile phone.
In the concert scene at the Albert Hall, after they finish the song with each individual pose, Victoria's back shot has both hands behind her, but once they go to the front shot, her hands are in front with one hand on her hip and the other up high. Once it goes to the back shot again her hands are behind her again.
The largest fish in the world is not the manta ray (23 feet wide). It's the whale shark at 40 feet long.
Emma puts a brown lollipop in her mouth (twice) and takes out a yellow one because the brand has two different sides.
It's explained that the Spice Girls are playing "alternate" versions of themselves. A few depictions/mentions about them are fictional (e.g. their manager Clifford, their origin story in a coffeehouse).
It is believed that mobile phones are not allowed in hospitals. Hospitals do allow mobile phones, as long as they are not being used during appointments.
The Spice Girls are able to change costumes/outfits very quickly, but this is a common cliche' in wacky films.
Apparently, the model of life jacket used is yellow when inflated and orange when deflated.
In the scene where the girls are chatting on a blanket outside the haunted castle, it's obvious that Geri is "discreetly" mouthing others' lines, particularly Emma's.
Immediately after Nicola delivers her baby, she sits right up and holds a clean baby without umbilical cord and with teeth.
When the kids and Victoria fall off the boat, it's clear that the little girl actually jumped off instead of falling.
On the board of the girls' schedule behind Clifford in his office on the bus, the word "Competition" is misspelled as "Competion".
At the beginning of the movie, as the girls are heading to the bus past all the fans, Mel C. is heard to say "What was that you said, Clifford?" but she's in the shot and her mouth is clearly not moving.
When the Spice Girls are in the hospital room with Nicola, talking about what giving birth feels like, Mel B. says "Oh" but her mouth doesn't move.
Reflected in Clifford's glasses when talking to Greydon about the movie for the first time.
The girls' manager tells Dennis to go to the Royal Albert Hall. The next scene is them going in the exact wrong direction--but then they miraculously appear at the entrance. They cross Tower Bridge and pass Battersea Power Station, which would mean that they would need to travel right through the center of London to get there.
When the Spice Girls are talking to Brayden at the end, the boom mic shadow is visible at the bottom right corner of the screen.
When Graydon says "two old nuns pull up in a Mini-Metro right in front", the nuns materialize, but they're in a Mini-Minor.