Someone reported this as a goof but it isn't: "

"When Wayne pulls the wanted poster off the wall in the first scene, the bullet holes are in the poster but not in the wall behind."

Randy (Wayne) clearly notes that there are no holes in the wall; he touches the wall.

The wanted posters were posted to a tree at the gang's hideout and used for target practice. After the holes were shot out, the boss signed them, afterwards which they were left behind at crime scenes to taint the sheriff.