Something Fishy This Way Comes - S4-E13
Continuity mistake: When Dmitry and Hank are talking while waiting for Amir to return, Boris approaches Dmitry and hands him a drink. The drink is initially in Dmitry's left hand, but when the shot cuts, the drink has jumped to his right hand. (00:26:35)
Continuity mistake: Jill writes Hank a goodbye letter which she hands to a friend to deliver. In the letter which Hank reads the next day, Jill states how beautiful Africa is and how Hank must visit. She wrote this before she left and had not seen Africa yet.
Trivia: Evan was originally written as Hank's best friend. But when Paulo Costanzo was cast, his physical resemblance to Mark Feuerstein inspired Andrew Lenchewski to turn the characters into brothers.