When Alec's corpse is laid down, his head is placed on the curb. In the next shot he is shown laying about 2 feet away from the curb.
At the end when Alec's corpse is brought back, Hester leans over his corpse and his left arm can be seen to move upwards.
Lady Maria's dinner for Lord Walderhurst, he is holding his soup spoon in his right hand. It is later revealed in the story that he is left-handed.