Ugly Berry - S3-E6
Continuity mistake: Kimmy Keegan gets new Mode business cards and asks Betty what her cards say. Betty says she doesn't have business cards. But in 1-4, "Fey's Sleigh Ride" Betty is given business cards and hands them out at a bar.
Continuity mistake: At the baseball game, when Matt holds out his keycard for Betty the keycard's magnetic stripe is at the top, but it switches to the bottom, then it's back at the top. (00:23:05)
Continuity mistake: When Dan finally finds DJ under the boardwalk, DJ pulls his hair back behind his ears. After multiple shots his hair is in front and behind his ears.