Replacements - S1-E4
Continuity mistake: In the shot before Buck falls back he fires twice. The first time it's ok, the second time the cocking bolt on the side of his Thompson doesn't move.
Replacements - S1-E4
Continuity mistake: We see Cobb firing over a small wall that is disintegrated by mortar fire. The camera does an instant cut and now Cobb is just hiding, not firing. (00:36:20)
Replacements - S1-E4
Continuity mistake: Just after the Sherman has knocked down the telephone pole we see two German guys up on a roof. In the long shot there is a bullet hole in the brickwork in front of them and in the close up it's gone. (00:34:30)
Replacements - S1-E4
Continuity mistake: When the medic is shot while attending to Patton, he is shot in the left leg but holds his right leg while on the ground. (00:27:00)
Answer: To mess with him. A lot of the "regular" soldiers didn't respect or even like Webster early on because he was a college boy. That dislike and lack of respect was deepened when Webster took what they perceived to be an extended stay in hospital after being wounded when many of their other comrades - Popeye for example - left hospital early to get back with their friends to fight.
He couldn't leave hospital early because he was in England. The wound in Band of Brothers was perceived a lot less serious than it was, and a lot of easy men were happy to have him back, especially Luz.
If you read the literature around Band of Brothers, you'll find that Kenyon Webster was perceived as a slacker in the sense that, while not precisely a coward, would never volunteer to put himself in harm's way. He only did as told and nothing more. So, regardless of the reasons why he really couldn't go back to Easy, his friends were predisposed to feel he was slacking off at the hospital while they were risking their lives.
Nauticalisimo