I Seem to Be Running Out of Dreams for Myself - S1-E1
Continuity mistake: Harry hands Walter Blunt a cup of liquid to drink, and Walter takes it in his hand. The next shot Harry still has the cup on a plate.
If It Comes in a Plastic Bag, Don't Eat It - S2-E2
Continuity mistake: Walter's champagne glass switches positions between shots as he speaks with Cornelia.