When Mr. and Mrs. Jenkins are in bed at the Airbnb, Brooke's nightdress strap changes from being on to off the shoulder between shots.
After reading the text message on Brooke's phone received from John, Alexis blocks the caller. Next scene shows John in the car saying "message not received?".
The message has already being delivered. So it is not possible for him to get a message undelivered feedback.
Lindsay Hartley's name is misspelled as 'Harley' in the beginning credits as one of the two writers.