The amount of whitewash on Father's face changes between shots.
When Roderick falls into the puddle at the end, his hat is floating as he's submerged but has disappeared when he surfaces.
When Ron kicks the tiles below him on the roof they fall away; in the next shot there are tiles directly below where he's sitting.
In a bizarre sequence at the beginning, Dexter gets a lift from father in what's supposed to be a rainstorm but is obviously shot on a lovely sunny day.