Saving Face - S3-E3
Revealing mistake: After they drop the casket and Provenza says 'guess you can take it with you!', the close up of the dead girl shows her close her mouth.
Revealing mistake: When Caitlin gets pushed down by the guy stealing her scooter, she hits her head on a rock and blacks out. The 'rock' is seen compressing from its foam design. (00:10:30)
Sweet Johnny - S4-E5
Revealing mistake: The air mattress embedded in the ground that cushions their fall, and the curly hair and face of the stuntman for Earl are quite obvious when Earl and Sweet Johnny hit the ground.