Continuity mistake: During the Ball scene at Netherfield, right before one of the dances, a shot of Lizzy reveals Jane in the background moving in slow motion.
No, This Is Not Based Entirely on Julie's Life - S2-E1
Continuity mistake: When Jimmy is talking to Dave in Dave's office, there is a shot of Dave - his laptop is open, he is reaching to close it, then there is a shot of Jimmy and the laptop is already closed.