The narration needs to keep track of where you are in the film's present--in this case, somewhere between 1986 and 1988---while letting us know that we're seeing is from the past, and how it in from the present. What to do about the cash register thefe? This sounds like one of those facts that is " too good to check," but it must be done.If you know that the theft occurred two days before Reagan's visit, and you really want to use it, you have to be a bit creative