When Blond Mohawk is running through the park he is barefoot, But when he runs away after the accident he's wearing shoes.
In the first shot a semi-automatic pistol is being loaded from a box labeled as revolver ammunition.
Simon and Alistair invade Maddy's home and hold her and David at gunpoint, demanding that they tell them where the missing watch is. Maddy repeatedly insists that she left it with the police. Eventually the thugs are convinced she isn't lying, but say they have ways to find out if she's telling the truth. And they say if the police don't have the watch, they'll come back and kill David and Maddy. After they leave, David reveals that he had the watch on his wrist all along.
In spite of that, these two thugs never appear again in the episode.