Sam posted on twitter that her wedding date was June 28th but the other couples were June 6 and 7.
According to season 2 spoiler, there were 3 couples married in Atlanta on June 5, 6 and 7
So it makes me wonder if Neil and Sam were a back up couple?
Also makes sense that they didn't show Neil and Sam getting their photo album, since their wedding date is way off from the other two couples
Also makes sense that last episode when Neil made a birthday party for Sam, it lines up with the date of her actual birthday. If she was married beginning of June, he celebrated it super early