Revealing mistake: When the bugs crawl out of E.G. Marshall's mouth, it is obviously a dummy.
Revealing mistake: When Ted Dansen gets buried in the sand, there isn't any extra sand piled up that was displaced by his body being in the hole.
Revealing mistake: In the beginning, just before the little boy gets slapped by his father, the red mark is already there.
Answer: Besides being in "Father's Day", it showed up in "The Lonesome Death Of Jordy Verrill" right next to the cash box at the Department of Meteors. In "Something To Tide You Over" on the nightstand next to Richard's bed. In "The Crate", it was on the writing desk when Henry writes the letter to Wilma. In "They're Creeping Up On You", Upson Pratt uses it as a soap dish. And in the epilogue, it appears on Billy's desk when he starts stabbing the voodoo doll.