How can Dudley run so fast??
In the opening scene him and Harry are running toward the underpass side by side. Reasonably-athletic-looking Radcliffe is at a near-sprint, yet the overweight Dudley actor is somehow able to keep pace with him. How was this possible to film?
(it also makes no sense in-world, as Harry should have left him in the dust or deliberately ran slowly so Dudley could keep up)