During the second wedding when Charles finds himself trapped in the room with the bride and groom, he is crossing the room, the lights are turned on you the door to his right is open. The next scene shows him reaching toward it and it is closed.
At the second wedding, Charles and Scarlet are depicted as sprinting to the church from their house. They live in Highbury and the church in the EC2 area of London - a distance of almost three miles which - whilst not impossible - is improbable.
At the second wedding, Angus and Laura, the couple married in the first wedding, are nowhere to be seen and their absence is not explained. Given that the bride at the second wedding (Lydia) was a bridesmaid at their wedding, it would be reasonable to expect to see them in attendance.