When they are in the convenient store, Kamala has lipstick at the slurry machine but when they walk to costume it's gone.
The (likely very light) mannequin's head could not have gathered so much momentum as to wreck everything in its path.
Chloe could not have held onto Thor's Hammer replica but should have been thrown out when it violently hit her.
When playing dodgeball in gym class, Kamala starts to fall before she is struck by the ball.
Kamala's graphic recreation of the "Battle of Earth" from Avengers Endgame shows Captain Marvel in the blue suit with red trim that she wore in her solo movie. For Endgame, she had switched to a red suit with blue trim, which Kamala is clearly aware of, as that's what she patterns her cosplay suit on.
This is a character error of New Jersey public transport department or bus driver. No Bus driver would just fly away the bus when a kid's bicycle falls off the bus and couldn't enter the bus. After all, they were teenagers, anyone would be caring enough to halt the bus so that the kid could pick her bicycle and take it into the bus. Or, the other passengers should have protested and make the bus driver help the kid.