Continuity mistake: In the opening scene, Sean and Beverly are on the phone with Eileen Jaffee. In some shots Sean is holding the phone upside down, and in others he's holding it the right way up.
Episode Four - S5-E4
Continuity mistake: When Sean, Beverly and Matt are brainstorming TV show ideas, Matt writes "whores!" on the whiteboard. His handwriting changes depending on the shot.
Episode Six - S5-E6
Continuity mistake: When Sean, Beverly and Matt are at dinner, the wine bottle is either next to the TV script or on top of the TV script depending on the shot.
Episode Six - S4-E6
Continuity mistake: When Beverly and Carol are walking through the park, Carol begins having a conversation on her phone and Beverly begins to mimic what she is saying. Whilst this is happening, in the far background, there are two people shown walking in the opposite direction and also a man walking in the same direction as Beverly and Carol. As the shot ends the man is far past the other two walking in the opposite direction. The shot then changes and the man walking forwards and the other two people walking in the opposite direction walk past each other a second time.