The original movie poster for Friday the 13th: The Final Chapter (part 4 in the series) shows Jason's iconic hockey mask on it with a cut on the right side of his mask.
Jason's hockey mask does not have a cut on the right side. The mask has a cut on the left side above the left eye. Fans of the series are aware that Jason's hockey mask is not authentic unless it has the trademark cut in it above the left eye. The cut occurs in Friday the 13th part 3 when Jason gets an axe to the face above his left eye by Chris.
Why does the movie poster show the cut on the wrong side of the mask?
Note: The cover of the DVD that I own also shows the cut on the right side of the mask.