Gabby locks the hotel room door using the dead bolt, but moments later, Carlos leaves the room without unlatching the lock.
Danielle states that she will turning 18 the coming weekend. Danielle was stated to have turned 17 one month prior to the season 2 episode "No One Is Alone". Season 2 ended two episodes after this, with Mike being run over. In the season 3 episode "What Would We Do Without You?" Susan states that it has been one year since Mike was run over. This means Danielle should be closer to 19 instead of only turning 18.
When Danielle, Bree, Orson, and Sylvia are at the pool, Danielle's hands change from being crossed on her stomach in the scenes when we are looking at her, to being on the table or on her ankle.