In this fourth installment in the Emma chapter book series, Emma completely forgets a planned outing with her best friend, something they have both been happily anticipating for weeks, when a new girl joins her class. While I can certainly understand wanting to impress a new friend, and possibly even going overboard to do it, it seems unlikely to me that Emma would completely forget her current best friend in the process. Ignore her friend's needs on a temporary basis - maybe. But not totally dropping her BFF for someone else, especially not after that happened to Emma herself in a previous book. Emma seems too smart and considerate to behave in a completely contradictory manner from her typical personality.
Since Emma wants to be a nature scientist when she grows up, animal facts are tucked into insets periodically throughout the book, where that animal is mentioned.