The postcard **SPOILERS**
I'm rewatching the movie (I loved it!) and I paused it on the part where John takes the postcard out of the mailbox. It's actually POSTMARKED in Australia :O Do you think that was a goof? Or intentional? Maybe Warwick takes trips all over the world and mails the postcards to himself? (to further support the crazy imaginary world he's created--like how he prepared dinner for all of his guests) Or maybe he owns a stamp that looks like a postmark that he can customize. haha
Just thought that was an interesting find.