Reynolds vs. Reynolds: The Cereal Defense - S8-E10
Continuity mistake: During Mac's presentation of science being wrong sometimes, the "bitch" labels move around after he slaps them on.
Continuity mistake: During dinner, items on Frank and Charlie's table move around, for example, the pepper shifts, most noticeably when the house wine is brought over.
Charlie's Mom Has Cancer - S8-E6
Continuity mistake: P-Diddy's glasses appear and disappear when we first see him.
The Gang Gets Analyzed - S8-E5
Continuity mistake: When Dennis tells Mac to take a size pill, the bottle has the cap on. But in the next shot, the cap is off and in Dennis' hand.
Reynolds vs. Reynolds: The Cereal Defense - S8-E10
Continuity mistake: As Dee says "I would like a five with my client" she puts her arm across Dennis' arms. Shot cuts to the side and both her arms are clasped in front of her.