Continuity mistake: Sam is barefoot while reading her book on the lounge chair, but she has flip-flops on a few minutes later.
Suggested correction: It's not uncommon for people wearing sandals to slip them on and off, wasn't she getting ready to leave anyway at that point?
No, this was before she decided to leave, she was just sitting in the chair still reading.
Continuity mistake: Lawrence is giving a ride to a guy who is on the phone. There is an older vehicle behind them. The older vehicle moves closer when the scene changes. The entire time, we can see out the back window.