Character mistake: In Season 5, Episode 4 ("The Heart Attack Boys"), Abishola twice gives Christina an injection without swabbing her skin with alcohol. Abishola is an RN and would never make that mistake.
Joey and the High School Friend - S2-E11
Character mistake: Michael and Jimmy appears to have behavioral similarities. Joey therefore asks Gina when she slept with Jimmy, implying that he might be the father. Gina answers "22 years ago." Joey then asks how old Michael is, and Gina answers "22 years and 9 months." What? So he was born 9 months before the conception? Shouldn't he be 21 years and 3 months? (00:11:40 - 00:12:20)