I think this video presentation (9:31) is based on the work of Tim McGrew. From the YouTube description:
An undesigned coincidence occurs when one account of an event leaves out a bit of information that doesn’t affect the overall picture, but a different account indirectly supplies the missing detail, usually answering some natural question raised by the first. Forgers do not want to leave loose ends like this that might raise awkward questions; they take care to tie everything together neatly. But these are just the sort of things we would expect to find in authentic and at least partly independent records of the same real event told by different people. This video examines several of these undesigned coincidences in the Gospels of Matthew, Mark, Luke & John.