So I've seen lots of reviews and it clear no one has read the book. (Which is 10 times better btw) The movie did not stick to the original interactions and events.
1. The mc agreed to the babysitting thing so she could make money
2. The child she babysat was very misbehaving
3. The opening scene were we meet the boogie manis very different.
4. Liz was a necessary asset to the plot.
And 5. The writing was better.
My advice, read the book