Chapter One: The River's Edge - S1-E1
Revealing mistake: When Hermione opens the bag of money, one stack says "Motion Picture Use Only." (00:29:45)
Chapter Four: The Last Picture Show - S1-E4
Continuity mistake: Archie and Betty are shown as living in houses next to each other, but in shots of their houses, Betty's address number is 111, while Archie's is 2037.
Betty Cooper: I'm not gonna ask what you did with Veronica at Cheryl's. I'm asking you now, right now, if you love me, Archie, or even like me?
Archie Andrews: Of course I love you, Betty. But I can't give you the answer you want.
Betty Cooper: Why?
Archie Andrews: You are so perfect. I've never been good enough for you. I'll never be good enough for you.