In the Blood - S1-E4
Continuity mistake: Karen is talking to Urich in a diner as he is drinking from a mug. As she is saying there has to be a trail, the camera is behind Urich and pointing at him fiddling with his cup. In this shot, he places his thumb over the rim of the cup down inside it. Then in the next shot from over Karen's shoulder, suddenly he is just holding the cup normally. (00:12:24)
Answer: There are none. Only nods to the comics.
MasterOfAll