I offended a representative of the church during the rehearsal by trying to stand where I normally stand to shoot (On the groom's side, behind and to the side of the officiant, to get the face of the bride).
These things need to all be worked out during the rehearsal. I go over every movement (often I'll cover the aisle for the entrance, then retreat back to my "bunker" for the ceremony, then slink to the rear for the exit) and get each one "blessed" by the offficiant.
When doing multi-cam wedding shoots, it is crucial to get approval for either the rearward or forward triangle positions. If using the forward positions, the couple and officiant need to be made aware that the couple should face each other and as much as possible, refrain from turning their heads toward the officiant, else their video be of the backs of their heads!
To ensure I'll have enough time to get to the rear for the exit, I'll sometimes ask the officiant for a prayer that the video guy gets to the rear in time. This bit of humor serves to ensure he'll remember not to release the couple until I'm there, but more so - I am involving the officiant in the camera placement and movement planning and getting his approval.
Recently, I had a minister rather sternly object to my wanting to place the transmitter on his belt at the small of his back, saying, "I always put them here." (Indicating his jacket pocket.) I replied with a smile, "Oh no you don't! We've had too many problems with transmitters placed there - this one is going here.." And to my surprise, he lifted the rear flap of his jacket to allow me to place the transmitter.
Several months ago, I helped put a list together of things needed to be done at the rehearsal to help with the outline for the upcoming WVDR video course. For the next four weddings, I kept coming up with new things to add to that list! So, even after doing over a hundred weddings, it's easy to overlook things at the rehearsal.