At the beginning of the episode, Sam has a large wound on the side of his arm that Samuel inquires after. At the end of the episode (in the last flashback), Sam never gets shot or takes any damage to get that wound (he hits his forehead when his thrown and his left arm potentially slams into a crowbar). When he kicks the Arachne, he is clutching the front of his arm, but there is no tear in the cloth. After Sam slices her head off, there is an injury on the side of his arm and cloth is torn where it wasn't before.