Continuity mistake: In the episode where Fiona is being harassed by Craig's wife, she's talking to Debbie about having a "birthday party." Debbie says her birthday is in October. Fast forward to season 7 when Monica returns and gets Franny back. She says she hasn't been that happy since the summer Debbie was born, to which Debbie replies that her birthday is in December.
Continuity mistake: After Fiona's return back home from the club where she's worked as a waitress, the blackish strips on her cheeks turn from partially rubbed off (justified by her wiping the tears) to perfectly fine a moment later, then change several more times during her discussion with Lip. (00:38:35 - 00:39:35)Wanderer