April Fools - S5-E18
Plot hole: As Mama tells Iola about the April Fools' jokes the family has played on her over the years, Iola expresses surprise. Considering Iola has been Mama's friend for years and is constantly at the Harper house, it seems impossible that Iola had never heard of any of the April Fools' pranks.
Plot hole: In the first series, Bomber mentions 'City's my team', referring to Bristol City, and dislikes the other Bristol based football club (Rovers). If this is the case, why is he wearing the distictive blue-and-white quartered shirt of Bristol Rovers in series 4? I know that people change allegiances, but it's very unlikely.